EP3291223B1 - Elektronisches schlaginstrument - Google Patents

Elektronisches schlaginstrument Download PDF

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Publication number
EP3291223B1
EP3291223B1 EP17188075.0A EP17188075A EP3291223B1 EP 3291223 B1 EP3291223 B1 EP 3291223B1 EP 17188075 A EP17188075 A EP 17188075A EP 3291223 B1 EP3291223 B1 EP 3291223B1
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EP
European Patent Office
Prior art keywords
strike
sensor
peripheral
central
central sensor
Prior art date
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Active
Application number
EP17188075.0A
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English (en)
French (fr)
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EP3291223A1 (de
Inventor
Ryo Takasaki
Ryo Susami
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Roland Corp
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Roland Corp
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Publication of EP3291223A1 publication Critical patent/EP3291223A1/de
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/146—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a membrane, e.g. a drum; Pick-up means for vibrating surfaces, e.g. housing of an instrument
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/143—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means characterised by the use of a piezoelectric or magneto-strictive transducer
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
    • G10H2220/155—User input interfaces for electrophonic musical instruments
    • G10H2220/161—User input interfaces for electrophonic musical instruments with 2D or x/y surface coordinates sensing
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
    • G10H2220/461—Transducers, i.e. details, positioning or use of assemblies to detect and convert mechanical vibrations or mechanical strains into an electrical signal, e.g. audio, trigger or control signal
    • G10H2220/525—Piezoelectric transducers for vibration sensing or vibration excitation in the audio range; Piezoelectric strain sensing, e.g. as key velocity sensor; Piezoelectric actuators, e.g. key actuation in response to a control voltage
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2230/00—General physical, ergonomic or hardware implementation of electrophonic musical tools or instruments, e.g. shape or architecture
    • G10H2230/045—Special instrument [spint], i.e. mimicking the ergonomy, shape, sound or other characteristic of a specific acoustic musical instrument category
    • G10H2230/251—Spint percussion, i.e. mimicking percussion instruments; Electrophonic musical instruments with percussion instrument features; Electrophonic aspects of acoustic percussion instruments or MIDI-like control therefor
    • G10H2230/275—Spint drum
    • G10H2230/285—Spint drum tomtom, i.e. mimicking side-mounted drums without snares, e.g. in a drumkit

Definitions

  • the present invention relates to an electronic percussion instrument. Particularly, the present invention relates to an electronic percussion instrument capable of calculating a strike position quickly.
  • a strike sensor configured to detect a strike is provided, and a strike position is detected based on a waveform detected by the strike sensor. Specifically, when a struck surface is struck, an initial half wave of a waveform detected by the strike sensor becomes shorter as the strike position is further from the strike sensor, and the initial half wave becomes longer as the strike position is closer to the strike sensor.
  • one strike sensor is provided at the center of a struck surface, and a strike position from the strike sensor is detected based on a length of an initial half wave of a waveform detected by the strike sensor.
  • the initial half wave of the waveform becomes longer. Therefore, in such a case, in order to detect a strike position, it is necessary to lengthen the detection time sufficiently. That is, an instruction for generating a striking sound is delayed accordingly.
  • a strike detection time is shortened in order to avoid the delay of an instruction for generating a striking sound, only a strike position on an outer peripheral portion of the struck surface may be detected.
  • a central sensor is disposed at the center of the struck surface and a peripheral sensor is disposed at the periphery of the struck surface. Accordingly, a strike position is calculated quickly and the instruction for generating a striking sound is not delayed.
  • US 2014/0020548 A discloses an electronic percussion device including a drum shell, a drumhead as striking surface, vibration sensors, and a peripheral and a central vibration carrier.
  • the vibration carriers abut against the drumhead to convey vibrations therefrom to the sensor(s).
  • the peripheral vibration carrier is a rigid body of solid material supported by peripheral sensors disposed thereunder. Two electrical leads of each one of the peripheral sensors are correspondingly coupled in parallel to produce only two common output leads.
  • An object of the present invention is to provide an electronic percussion instrument capable of calculating a strike position quickly.
  • an electronic percussion instrument of one of the embodiments of the present invention includes a struck surface, strike sensors configured to detect a strike on the struck surface, a first position calculation device, a second position calculation device and a sound production instruction device.
  • the strike sensors includes a central sensor disposed at a central portion of the struck surface when the struck surface is viewed in a plan view and a plurality of peripheral sensors.
  • the first position calculation device calculates a first strike position from the central sensor based on the initial half wave.
  • the second position calculation device calculates a second strike position based on a difference in strike detection by the plurality of peripheral sensors.
  • the sound production instruction device instructs production of a striking sound based on the first strike position calculated by the first position calculation device and the second strike position calculated by the second position calculation device.
  • the plurality of peripheral sensors are disposed in a region in which, when the struck surface is struck, the strike is able to be detected by the plurality of peripheral sensors within a second predetermined time after the central sensor detects the strike, and the peripheral sensors are disposed in a region in which the initial half wave of the strike waveform of the central sensor is able to be detected within the first predetermined time after the central sensor detects the strike.
  • the plurality of peripheral sensors detect a strike within the second predetermined time after the central sensor detects the strike.
  • the initial half wave of the strike waveform is a waveform output by the central sensor from a starting point caused by the strike to a zero cross point immediately thereafter.
  • the peripheral sensors are at least three peripheral sensors disposed along a circumference centered on the central sensor. Furthermore, the peripheral sensors are disposed in a region in which, when a position within the circumference formed by the three peripheral sensors is struck, the peripheral sensors are able to detect the strike within the second predetermined time after the central sensor detects the strike, and in a region in which, when the struck surface is struck, the initial half wave of the strike waveform is able to be detected within the first predetermined time after the central sensor detects the strike.
  • the second position calculation device calculates the second strike position within the circumference in which the peripheral sensors are disposed based on a difference in strike detection by the peripheral sensors.
  • the struck surface is formed in a circular shape, a rectangular shape, a polygonal shape, or a shape in which curved lines and straight lines are combined when the struck surface is viewed in a plan view.
  • the peripheral sensors are disposed to surround the central sensor.
  • the peripheral sensors are disposed along the circumference centered on the central sensor or along a line of a polygonal shape or an elliptical shape surrounding the central sensor, and the peripheral sensors are disposed at equal intervals or unequal intervals.
  • the electronic percussion instrument includes a first strike position table in which the first strike position corresponding to a first variable is stored, wherein a section from the starting point of the initial half wave of the central sensor to the zero cross point is set as a pitch of the initial half wave, the pitch of the initial half wave is used as the first variable.
  • the first position calculation device calculates the first strike position based on the first strike position table.
  • the electronic percussion instrument includes a second strike position table in which the second strike position corresponding to a second variable is stored, wherein a difference in strike detection by the peripheral sensors is used as the second variable.
  • the second position calculation device calculates the second strike position based on the second strike position table.
  • the electronic percussion instrument further includes a third position calculation device.
  • the third position calculation device calculates a third strike position by weighted computation of the first strike position calculated by the first position calculation device and the second strike position calculated by the second position calculation device.
  • the sound production instruction device instructs production of the striking sound based on the third strike position calculated by the third position calculation device.
  • an electronic percussion instrument includeing a struck surface, strike sensors configured to detect a strike on the struck surface, a first position calculation device, a second position calculation device.
  • the strike sensors include a central sensor disposed at a central portion of the struck surface when the struck surface is viewed in a plan view and a peripheral sensor that is a ring sensor formed in a circular shape along a circumference centered on the central sensor.
  • the first position calculation device calculates a first strike position from the central sensor based on the initial half wave.
  • the second position calculation device calculates a second strike position based on a difference in strike detection by the central sensor and the peripheral sensor.
  • the peripheral sensor is disposed in a region in which, when a position within the circumference formed by the ring sensor is struck, the ring sensor is able to detect the strike within a second predetermined time after the central sensor detects the strike and in a region in which, when the struck surface is struck, an initial half wave of the strike waveform is able to be detected within the first predetermined time after the central sensor detects the strike.
  • the second position calculation device calculates the second strike position within the circumference in which the ring sensor is disposed based on a difference in strike detection by the central sensor and the ring sensor.
  • the ring sensor has ring shape.
  • the electronic percussion instrument of the present invention further includes a third position calculation device and a sound production instruction device.
  • the third position calculation device calculates a third strike position by weighted computation of the first strike position calculated by the first position calculation device and the second strike position calculated by the second position calculation device.
  • the sound production instruction device is configured to instruct to produce a striking sound based on the third strike position calculated by the third position calculation device.
  • the difference in strike detections is a difference in strike detection times or a difference in strike strengths.
  • a strike position within the circumference in which the ring sensor is disposed is calculated based on results detected by the central sensor and the ring sensor, and a strike position outside the circumference is calculated based on the result detected by the central sensor.
  • one of the emboidments of the present invention provides an electronic percussion instrument includeing a struck surface, strike sensors configured to detect a strike on the struck surface, a first position calculation device, a second position calculation device, a third position calculation device and a sound production instruction device.
  • the strike sensors include a central sensor disposed at a central portion of the struck surface when the struck surface is viewed in a plan view and a plurality of peripheral sensors.
  • the first position calculation device calculates a first strike position from the central sensor based on the initial half wave.
  • the second position calculation device calculates a second strike position based on a difference in strike detection by the plurality of peripheral sensors.
  • the third position calculation device calculates a third strike position by weighted computation of the first strike position calculated by the first position calculation device and the second strike position calculated by the second position calculation device.
  • the sound production instruction device instructs production of a striking sound based on the third strike position calculated by the third position calculation device.
  • the first position calculation device calculates a first strike position from the central sensor based on an initial half wave detected by the central sensor. Therefore, according to the electronic percussion instrument, when the struck surface is struck, the second position calculation device calculates a second strike position based on a difference in strike detection by a plurality of sensors among a central sensor and peripheral sensors, including at least one peripheral sensor.
  • the sound production instruction device instructs production of a striking sound based on the first strike position calculated by the first position calculation device and the second strike position calculated by the second position calculation device.
  • the struck surface when struck, if an initial half wave of the strike waveform can be detected within a first predetermined time after the central sensor detects the strike, the first strike position can be calculated by the first position calculation device.
  • the struck surface if an initial half wave of the strike waveform is not able to be detected within the first predetermined time after the central sensor detects the strike, this causes a problem.
  • the peripheral sensor is disposed in a region in which, when the struck surface is struck, the strike can be detected within a second predetermined time after the central sensor detects the strike and in a region in which an initial half wave of the strike waveform can be detected within the first predetermined time after the central sensor detects the strike. Therefore, when the struck surface is struck, even if an initial half wave of the strike waveform is not able to be detected within the first predetermined time after the central sensor detects the strike, the central sensor or the peripheral sensor can detect the strike within the second predetermined time.
  • the second position calculation device can calculate the second strike position based on a difference in strike detection by a plurality of sensors among the central sensor and peripheral sensors, including at least one peripheral sensor. In this manner, when the central sensor and the peripheral sensors are disposed, the second strike position can be calculated based on the detection result within the second predetermined time. Therefore, even when the struck surface is formed in a large size, it is possible to quickly calculate the strike position. That is, the instruction for generating a striking sound is not delayed.
  • the strike position within the circumference centered on the central sensor is calculated based on the result detected by the central sensor or the peripheral sensors. Furthermore, the strike position outside the circumference is calculated based on the result detected by the central sensor. That is, the second position calculation device calculates the second strike position within the circumference based on a difference in strike detection by the peripheral sensors.
  • the peripheral sensors are disposed in a region in which, when a position within the circumference is struck, the strike can be detected within the second predetermined time after the central sensor detects the strike. Therefore, detection by the peripheral sensors is performed within the second predetermined time, and the second strike position within the circumference can be calculated.
  • the first position calculation device calculates the first strike position from the central sensor based on an initial half wave of the strike waveform detected by the central sensor.
  • the peripheral sensors are disposed in a region in which, when the struck surface is struck, an initial half wave of the strike waveform can be detected within the first predetermined time after the central sensor detects the strike. Therefore, when a region outside the circumference is struck, the central sensor can detect an initial half wave of the strike waveform within the first predetermined time. Accordingly, detection by the central sensor is performed within the first predetermined time, and the strike position outside the circumference can be calculated.
  • the strike position within the circumference in which at least three of the peripheral sensors are disposed is calculated based on results detected by the central sensor or the peripheral sensors, and the strike position outside the circumference is calculated based on the result detected by the central sensor.
  • the strike position within and outside the circumference can be calculated based on the detection result within a predetermined time. Therefore, even when the struck surface is formed in a large size, it is possible to quickly calculate the strike position. That is, the instruction for generating a striking sound is not delayed.
  • the shape of the struck surface may be any shape, for example, a circular shape or a rectangular shape.
  • a region in which the first strike position is calculated based on the result detected by the central sensor and a region in which the second strike position is calculated based on the results detected by the peripheral sensors may be arranged adjacent to each other or may be disposed in a partially overlapping manner.
  • a second strike position table in which a difference in strike detection by the peripheral sensor is used as a second variable and the second strike position corresponding to the second variable is stored is provided, and the second strike position is calculated based on the second strike position table. In this manner, it is possible to quickly calculate the second strike position within the circumference in which the peripheral sensors are disposed.
  • the strike position within the circumference in which a ring sensor that is a peripheral sensor is disposed and within the circumference centered on the central sensor is calculated based on the results detected by the central sensor and the ring sensor.
  • the strike position outside the circumference is calculated based on the result detected by the central sensor. That is, the second position calculation device calculates the second strike position within the circumference based on a difference in strike detection by the central sensor and the ring sensor.
  • the ring sensor is disposed in a region in which, when a position within the circumference is struck, the strike can be detected within the second predetermined time after the central sensor detects the strike.
  • the first position calculation device calculates the first strike position from the central sensor based on an initial half wave of the strike waveform detected by the central sensor.
  • the ring sensor is disposed in a region in which, when the struck surface is struck, an initial half wave of the strike waveform can be detected within the first predetermined time after the central sensor detects the strike. Therefore, when a region outside the circumference is struck, the central sensor can detect an initial half wave of the strike waveform within the first predetermined time. Accordingly, detection by the central sensor is performed within the first predetermined time, and the strike position outside the circumference can be calculated.
  • the strike position within the circumference in which the ring sensor is disposed is calculated based on the results detected by the central sensor and the ring sensor, and the strike position outside the circumference is calculated based on the result detected by the central sensor.
  • the strike position within and outside the circumference can be calculated based on the detection result within a predetermined time. Therefore, even when the struck surface is formed in a large size, it is possible to quickly calculate the strike position. That is, the instruction for generating a striking sound is not delayed.
  • the shape of the struck surface may be any shape, for example, a circular shape or a rectangular shape.
  • a region in which the strike position is calculated based on the result detected by the central sensor and a region in which the strike position is calculated based on the result detected by the ring sensor may be arranged adjacent to each other or may be disposed in a partially overlapping manner.
  • the third position calculation device calculates a third strike position by weighted computation of the first strike position calculated by the first position calculation device and the second strike position calculated by the second position calculation device. Therefore, it is possible to calculate the strike position more accurately.
  • Fig. 1 is an exploded perspective view of the electronic drum 1 according to an embodiment of the present invention.
  • Fig. 2 is a cross-sectional view of the electronic drum 1.
  • a part of the electronic drum 1 is not shown in order to facilitate understanding.
  • the upper side in Fig. 1 and Fig. 2 is defined as the upper part of the electronic drum 1 and the lower side thereof is defined as the lower part of the electronic drum 1.
  • the electronic drum 1 is an electronic percussion instrument simulating a drum which is played using a stick or the like held by a performer.
  • the electronic drum 1 comprises a shell 2, a head 3, a rim 4, a fixing portion 5, a frame 6, a control device 7, a central sensor 10, and a plurality of peripheral sensors (a first peripheral sensor 20, a second peripheral sensor 30, and a third peripheral sensor 40).
  • the shell 2 has an upper end (an upper end in Fig. 1 and Fig. 2 ) that is open.
  • the head 3 covers the opening of the upper end of the shell 2.
  • the rim 4 is connected to the outer edge of the head 3.
  • the rim 4 is attached to the fixing portion 5.
  • the frame 6 is disposed to face the head 3 and is disposed on the inner circumference side of the shell 2.
  • the control device 7 is supported by the frame 6.
  • the central sensor 10 is disposed between the head 3 and the frame 6 and is disposed on the center of a struck surface (a film member 3a to be described below) in a plan view.
  • the plurality of peripheral sensors (the first peripheral sensor 20, the second peripheral sensor 30, and the third peripheral sensor 40) are disposed on the peripheral sides of the struck surface (the outside in the radial direction of the film member 3a) in a plan view relative to the central sensor 10.
  • the electronic drum 1 When a performer strikes the struck surface using a stick (not shown) or the like, the electronic drum 1 outputs results detected from the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 based on the strike to a sound source 76 (refer to Fig. 4 ). A musical sound signal based on the detection results is generated by the sound source 76. The musical sound signal is output to a speaker 78 through an amplifier 77 (refer to Fig. 4 ), and an electronic musical sound based on the musical sound signal is emitted from the speaker 78.
  • the shell 2 is formed in a cylindrical shape with both ends in the axial direction (both upper and lower ends) being open and with an outer diameter that is 14 inches.
  • the outer diameter of the shell 2 is not limited to 14 inches, and the outer diameter can be set to less than 14 inches or greater than 14 inches.
  • the head 3 comprises the film member 3a that is formed as the struck surface and an annular frame portion 3b to which the outer edge of the film member 3a is bonded.
  • the film member 3a has a disk shape and is formed of a mesh-like material obtained by weaving synthetic fibers or a film-like material including a synthetic resin.
  • the frame portion 3b is formed of a synthetic resin or a metallic material, and the film member 3a is fixed to the frame portion 3b.
  • the rim 4 is an annular member that applies a tension to the head 3.
  • the rim 4 comprises a cylindrical frame contact portion 4a, an annular elastic member 4b, and an annular flange portion 4c.
  • the frame contact portion 4a has a lower end (an end on the side of the fixing portion 5 and an end on the lower side of Fig. 2 ) that is in contact with the frame portion 3b.
  • the elastic member 4b is disposed along the entire circumference on an upper end (an end on the side opposite to the end in contact with the frame portion 3b) of the frame contact portion 4a.
  • the flange portion 4c projects from the lower end of the frame contact portion 4a toward the outside in the radial direction.
  • the frame contact portion 4a is a portion that applies a fastening force of a bolt B1 (to be described below) to the frame portion 3b and stretches the film member 3a.
  • the inner diameter of the frame contact portion 4a is set to be greater than the outer diameter of the shell 2 and smaller than the outer diameter of the frame portion 3b.
  • the elastic member 4b is a portion that is struck by a performer and is formed of an elastic material such as sponge, rubber, and a thermoplastic elastomer.
  • a plurality of through holes into which the bolts B1 are inserted are formed at positions corresponding to fastened portions 5c (to be described below).
  • the fixing portion 5 is a member for fixing the head 3 and the rim 4 to the shell 2.
  • the fixing portion 5 comprises an annular portion 5a, a plurality of projections 5b, and a plurality of fastened portions 5c.
  • the annular portion 5a is fixed to the lower end (the lower end in Fig. 2 ) of the shell 2.
  • the plurality of projections 5b are formed to project from the annular portion 5a toward the outside in the radial direction.
  • the plurality of fastened portions 5c stand upward from the plurality of projections 5b.
  • the annular portion 5a has an annular shape and is formed of a synthetic resin or a metallic material.
  • the annular portion 5a and the projection 5b are integrally formed.
  • the fastened portion 5c is fixed to the projection 5b by a screw (not shown).
  • the fastened portion 5c has a cylindrical shape, and is formed of a metallic material and has an inner circumferential surface on which a female screw is formed.
  • the frame 6 is a bowl-shaped member that supports various members such as the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 on the inner circumference side of the shell 2.
  • the frame 6 is formed of a synthetic resin.
  • the frame 6 comprises a bottom 6a, a side wall 6b, a plurality of central protrusions 6c, a connecting portion 6d, a plurality of ribs 6e, and a peripheral protrusion 6f.
  • the bottom 6a is arranged to face the head 3 with a predetermined distance therebetween.
  • the side wall 6b stands from the outer edge of the bottom 6a.
  • the plurality of central protrusions 6c stand from the bottom 6a to the head 3 side.
  • the connecting portions 6d connect the plurality of central protrusions 6c.
  • the plurality of ribs 6e radially extend toward the side wall 6b from the central protrusions 6c and the connecting portions 6d.
  • the peripheral protrusions 6f are integrally formed with the
  • a curved portion 6b1 that projects toward the outside in the radial direction and is curved downward is formed.
  • the central protrusion 6c is a portion to which the central sensor 10 is attached. A base end of the central protrusion 6c is integrally formed with the bottom 6a.
  • the plurality of central protrusions 6c (three central protrusions 6c in the present embodiment) are disposed in the circumferential direction of the shell 2.
  • the connecting portions 6d are formed to connect the plurality of central protrusions 6c in the circumferential direction of the shell 2.
  • the plurality of ribs 6e (twelve ribs 6e in the present embodiment) are connected to the central protrusions 6c and the connecting portions 6d.
  • the plurality of ribs 6e have a flat plate shape and are formed to stand from the bottom 6a and are arranged at equal intervals in the circumferential direction of the shell 2.
  • a pair of peripheral protrusions 6f are formed in each of three of the ribs 6e.
  • the peripheral protrusions 6f are formed in pairs in a direction in which the rib 6e extends. Female screw holes are formed on upper ends of the pair of peripheral protrusions 6f.
  • the pair of peripheral protrusions 6f are disposed at three positions in the circumferential direction of the shell 2.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at the three pairs of peripheral protrusions 6f. Accordingly, the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at equal intervals in the circumferential direction of the shell 2.
  • the central sensor 10 is a sensor configured to detect a strike on the struck surface and is disposed at the center of the frame 6 in a plan view.
  • the central sensor 10 comprises a plate 11, a head sensor 13, and a cushion member 14.
  • the plate 11 is attached to a tip of the central protrusions 6c.
  • the head sensor 13 is bonded to the head 3 side of the plate 11 using a double-sided tape 12.
  • the cushion member 14 is bonded to the head 3 side of the head sensor 13.
  • the plate 11 has a disk shape and is formed of a metallic material. At the outer edge of the plate 11, three fixed portions 11a that project toward the outside in the radial direction of the shell 2 are formed. The fixed portion 11a is fixed to a tip of the central protrusion 6c by a bolt B2.
  • the head sensor 13 is a disk-shaped sensor configured to detect a strike on the struck surface and comprises a piezoelectric element.
  • the cushion member 14 is a truncated conical cushioning member formed of an elastic material such as sponge, rubber, and a thermoplastic elastomer. The upper end of the cushion member 14 is disposed to abut the film member 3a.
  • the first peripheral sensor 20, the second peripheral sensor 30, and the third peripheral sensor 40 are sensors configured to detect a strike on the struck surface. These sensors are disposed at equal intervals along the circumference centered on the central sensor 10 in a plan view.
  • the first peripheral sensor 20, the second peripheral sensor 30, and the third peripheral sensor 40 are the same sensor except that disposed positions are different. Therefore, components of the second peripheral sensor 30 and the third peripheral sensor 40 are denoted by the same reference numerals as those of the first peripheral sensor 20, and details thereof will not be described.
  • the first peripheral sensor 20 (the second peripheral sensor 30 and the third peripheral sensor 40) comprises a plate 21, a head sensor 23, and a cushion member 24.
  • the plate 21 is attached to a tip of a pair of first peripheral protrusions 6f.
  • the head sensor 23 is bonded to a surface on the head 3 side of the plate 21 using a double-sided tape 22.
  • the cushion member 24 is bonded to a surface on the head 3 side of the head sensor 23.
  • the plate 21 has a disk shape and is formed of a metallic material. At the outer edge of the plate 21, two fixed portions 21a that project in a direction in which the rib 6e extends are formed. The fixed portion 21a is fixed to the peripheral protrusion 6f by a bolt B3.
  • the head sensor 23 is a disk-shaped sensor configured to detect a strike on the struck surface and comprises a piezoelectric element.
  • the head sensor 23 is disposed at a position closer to the struck surface than the head sensor 13 of the central sensor 10. That is, an interval between the head sensor 23 and the film member 3a is formed to be shorter than an interval between the head sensor 13 and the film member 3a.
  • the cushion member 24 is a truncated conical cushioning member formed of an elastic material such as sponge, rubber, and a thermoplastic elastomer.
  • the cushion member 24 is formed of the same elastic material as the cushion member 14 of the central sensor 10.
  • the first peripheral sensor 20 to the third peripheral sensor 40 have substantially the same structure as the central sensor 10. That is, the cushion members 14 and 24 abut the film member 3a and the head sensors 13 and 23 are disposed on bottom surfaces of the cushion members 14 and 24. Therefore, compared to when the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are sensors having different structures, it is possible to reduce manufacturing costs of the electronic drum 1. In addition, there is no need to match characteristics of a strike output of the central sensor 10 and characteristics of strike outputs of the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, the design can be simplified accordingly.
  • the thickness (a standing height from the head sensor 23) of the cushion member 24 is set to be less (a standing height is lower) than the thickness (a standing height from the head sensor 13) of the cushion member 14.
  • the cushion member 14 is formed to be thicker than the cushion member 24. That is, the central sensor 10 is disposed at a position further from the struck surface relative to the first peripheral sensor 20 to the third peripheral sensor 40.
  • the head sensor 23 is disposed at a position closer to the struck surface than the head sensor 13. That is, an interval between the head sensor 23 and the film member 3a is formed to be shorter than an interval between the head sensor 13 and the film member 3a. Therefore, it is possible to compensate for such a decrease in detection sensitivity.
  • the head sensors 13 and 23 are disposed on the back side of the struck surface through the cushion members 14 and 24. Therefore, even if positions directly above the head sensors 13 and 23 are struck, the impact of the strike can be absorbed by the cushion members 14 and 24. Therefore, it is possible to protect the head sensors 13 and 23 from the impact of the strike and prevent damage thereto.
  • the thicknesses of the cushion members 14 and 24 be reduced and the head sensors 13 and 23 be disposed at positions as close as possible to the struck surface.
  • a strong hit on the struck surface may compress the cushion members 14 and 24 to an excessive extent and bring the struck surface most close to the head sensors 13 and 23.
  • the situation that the bottom of the struck surface compresses the cushion member to an excessive extent and bring the struck surface most close to the head sensor is called bottoming-out. That is, since it is not possible for the cushion members 14 and 24 to absorb the impact of the strike and the head sensors 13 and 23 are substantially directly hit, the head sensors 13 and 23 may be damaged.
  • the cushion members 14 and 24 are preferably formed with thicknesses such that the struck surface does not bottom out on the head sensors 13 and 23. Thus, the cushion members 14 and 24 are not to be compressed to an excessive extent to cause the struck surface to be most close to the head sensors 13 and 23 when the struck surface is strongly hit.
  • the thicknesses of the cushion members 14 and 24 are set to a thickness such that the struck surface does not bottom out on the head sensors 13 and 23. Thus, the cushion members 14 and 24 are not to be compressed to an excessive extent when the struck surface is strongly hit.
  • the vicinity in which the cushion members 14 and 24 abut the struck surface is hit by a stick while the cushion members 14 and 24 are removed, and a maximum amount of deflection of the struck surface (the film member 3a) is measured.
  • the amount of deflection varies according to a tension of the struck surface. Therefore, measurement is performed while the struck surface is stretched at the lowest tension within an expected range (a playable range).
  • the thicknesses of the cushion members 14 and 24 are preferably set to a thickness of about 1.5 to 2 times the maximum amount of deflection.
  • the thicknesses of the cushion members 14 and 24 are less than 1.5 times the maximum amount of deflection of the struck surface being strongly hit, the struck surface easily bottoms out on the head sensors 13 and 23, that is to say, the cushion members 14 and 24 are easily to be compressed to an excessive extent to cause the struck surface to be most close to the head sensors 13 and 23.
  • the thicknesses of the cushion members 14 and 24 are more than twice the maximum amount of deflection of the struck surface when strongly hit, detection sensitivity of the head sensors 13 and 23 decreases due to the excess thickness.
  • the thicknesses of the cushion members 14 and 24 are formed as a thickness of about 1.5 to 2 times the maximum amount of deflection of the struck surface when the struck surface is strongly hit. Therefore, it is possible to increase the detection sensitivity while preventing damage to the head sensors 13 and 23.
  • the maximum amount of deflection of the struck surface when strongly hit is 20 mm in the vicinity of the center of the struck surface (the vicinity in which the cushion member 14 abuts) and is 14 mm at the peripheral sides (the vicinity in which the cushion member 24 abuts). Therefore, the thickness of the cushion member 14 is set to 35 mm (1.75 times the maximum amount of deflection of 20 mm) and the thickness of the cushion member 24 is set to 25 mm (1.78 times the maximum amount of deflection of 14 mm). Therefore, even if the struck surface is strongly hit, it is possible to prevent the struck surface to bottom out on the head sensors 13 and 23. Thus, the cushion members 14 and 24 are prevented from being compressed to an excessive extent to cause the struck surface to be most close to the head sensors 13 and 23 and it is possible to increase detection sensitivity of the head sensors 13 and 23.
  • the cushion member 14 is formed to be thicker than the cushion member 24. That is, the cushion member 24 is formed to be thinner than the cushion member 14. Therefore, the head sensor 23 can be disposed at a position close to the struck surface relative to the head sensor 13.
  • the thicknesses of the cushion members 14 and 24 are set according to the amount of deflection of the struck surface when struck.
  • the thicknesses of the cushion members 14 and 24 are set to a thickness of about 1.75 times the amount of deflection. Therefore, it is possible to appropriately adjust positions (intervals between the film member 3a and the head sensors 13 and 23) at which the head sensors 13 and 23 are disposed relative to the struck surface while protecting the head sensors 13 and 23 with the cushion members 14 and 24.
  • the cushion members 14 and 24 are set in advance, and the head sensors 13 and 23 are disposed on bottom surfaces of the cushion members 14 and 24. Accordingly, it is possible to dispose the head sensors 13 and 23 at heights at which detection sensitivity can be increased without causing the struck surface to bottom out on the head sensors 13 and 23. Thus, the cushion members 14 and 24 are not compressed to an excessive extent while the struck surface is strongly hit.
  • one central sensor 10 is disposed at the center of the struck surface and a plurality of (three) peripheral sensors are disposed at equal intervals along the circumference centered on the central sensor 10. Therefore, when the inside of the circumference on which three peripheral sensors are disposed is struck, it is possible to detect a strike position with respect to the center of the struck surface according to a difference in detection times of strike signals detected by the three peripheral sensors.
  • the detected strike signal comprises a peak, a falling edge or a rising edge of a voltage waveform, which will be described below.
  • the detected waveform of the strike signal obtained by the central sensor 10 it is possible to detect a strike position with respect to the center of the struck surface outside the circumference on which the three peripheral sensors are disposed. Therefore, it is possible to appropriately detect a strike position with respect to the center of the struck surface with the central sensor 10 and the three peripheral sensors.
  • the thickness of the cushion member 24 is set to a thickness at which a strike signal (a peak to be described below) when the center of the struck surface is struck can be detected within a predetermined time by the head sensor 23.
  • the predetermined time is 2 ms after the central sensor 10 detects a strike.
  • 2 ms is a scan time of the central sensor 10 (to be described below).
  • the first peripheral sensor 20 to the third peripheral sensor 40 detect a peak of the strike (that is, detect whether a strike has occurred and a strength thereof). Therefore, from a time difference in peaks detected by the first peripheral sensor 20 to the third peripheral sensor 40, it is possible to detect a strike position in the vicinity of the center of the struck surface. Therefore, compared to when a strike position in the vicinity of the center of the struck surface is detected by the central sensor 10 based on an initial half wave pitch (to be described below), it is possible to detect a strike position in a shorter time.
  • Fig. 3 is a plan view schematically showing a sensor arrangement of the electronic drum 1.
  • the struck surface of the electronic drum 1 is viewed in a plan view, the struck surface is formed in a circular shape, and the central sensor 10 is disposed at the center of the struck surface.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at equal intervals along the concentric circumference centered on the central sensor 10. Therefore, in the entire region of the struck surface formed in a circular shape, it is possible to appropriately detect a strike and calculate a velocity thereof.
  • the center of the struck surface has a larger amount of deformation (an amount of deflection) of the struck surface than the peripheral portions of the struck surface. Therefore, the central sensor 10 disposed at the center of the struck surface has a wider range for the sensor output value with respect to a strike and more favorable strike detection sensitivity than the first peripheral sensor 20 to the third peripheral sensor 40 disposed at the peripheral portions of the struck surface.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions at which the following conditions are satisfied.
  • a waiting process of 2 ms after the central sensor 10 detects a strike will be referred below to as a "scan time of the central sensor 10."
  • a maximum value hereinafter referred to as a "peak"
  • a waveform of a first negative value in the strike according to sensor output values of the central sensor 10 that is, an initial half wave, can be detected.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions of "100" in Fig. 3 .
  • a strike position in the vicinity of the center of the struck surface is detected using sensor output values of the first peripheral sensor 20 to the third peripheral sensor 40. Further, other strike positions are detected using the sensor output values of the central sensor 10 and the sensor output values of the first peripheral sensor 20 to the third peripheral sensor 40. As will be described below, detection of a strike position for the central sensor 10 is performed by calculating a waveform of a first negative value in the strike according to the sensor output values of the central sensor 10, that is, a magnitude of a pitch of the initial half wave.
  • detection of a strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is performed by calculating a time difference for detecting peaks of the first peripheral sensor 20 and the second peripheral sensor 30 and a time difference for detecting peaks of the first peripheral sensor 20 and the third peripheral sensor 40.
  • a strike position is calculated by weighted computation of the strike position calculated by the central sensor 10 and the strike position calculated by the first peripheral sensor 20 to the third peripheral sensor 40.
  • the pitch of the initial half wave detected by the central sensor 10 may not be within the scan time of the central sensor 10.
  • the region of the strike position which can be calculated based on the pitch of the initial half wave detected by the central sensor 10 within a predetermined time after the center sensor 10 detects the strike excludes the vicinity of the center portion of the struck surface. At that time, it is not possible to accurately detect a strike position for the central sensor 10.
  • detection of a strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is performed by calculating a time difference for detecting peaks of the first peripheral sensor 20 and the second peripheral sensor 30 and a time difference for detecting peaks of the first peripheral sensor 20 and the third peripheral sensor 40.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions at which a peak can be detected within the scan time of the central sensor 10 after the central sensor 10 detects a strike. Therefore, even when the vicinity of the central sensor 10 is struck, within the scan time of the central sensor 10, it is possible to detect a strike position for the first peripheral sensor 20 to the third peripheral sensor 40.
  • a strike position is calculated using only the strike position detected by the first peripheral sensor 20 to the third peripheral sensor 40.
  • the further the distance from the central sensor 10 to the peripheral sensors 20-40 is, the longer the time from detecting the strike by the central sensor 10 to detecting the strike by the peripheral sensors 20-40 becomes. That is to say, the region of the strike which can be detected by the peripheral sensors 20-40 within a predetermined time after the central sensor 10 detects the strike is limited within the vicinity of the center of the struck surface.
  • the peripheral sensors 20 ⁇ 40 are disposed in a region of the strike which can be detected by the peripheral sensors 20 ⁇ 40 within a predetermined time after the central sensor 10 detects the strike, and also in a region of the strike, wherein the initial half wave of the strike can be detected by the central sensor 10 within a predetermined time after the central sensor 10 detects the strike.
  • a strike strength (a velocity) is performed by weighted computation of a peak of the central sensor 10 and peaks of the first peripheral sensor 20 to the third peripheral sensor 40 detected according to a strike.
  • a velocity is calculated from the peak of the central sensor 10 and the peaks of the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, the velocity is calculated from the central sensor 10 having high strike sensitivity and the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, the velocity can be calculated more accurately.
  • a scan time of a peripheral sensor when the central sensor 10 does not detect a strike in a waiting process of 2 ms (hereinafter referred to as "a scan time of a peripheral sensor") after the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike, the velocity is calculated from the peaks of the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, even if a weak strike is performed at an outer peripheral portion of the struck surface so that it is difficult for the central sensor 10 to detect the strike, the velocity is reliably calculated, and an instruction for generating a musical sound is issued based on the velocity.
  • a position of the center of the struck surface is set to "0" and a position of the outermost periphery in the struck surface is set to "127.”
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions of "100" at equal intervals. That is, the first peripheral sensor 20 to the third peripheral sensor 40 are arranged at positions of vertexes of an equilateral triangle.
  • a threshold value for determining whether calculation of a strike position is performed using only a strike position detected by the first peripheral sensor 20 to the third peripheral sensor 40 is set to a position of "75.”
  • Fig. 4 is a block diagram showing the electrical configuration of the electronic drum 1.
  • the electronic drum 1 comprises the control device 7 for controlling components of the electronic drum 1.
  • the control device 7 comprises a CPU 71, a ROM 72, and a RAM 73, which are connected via a bus line 74.
  • the central sensor 10, the first peripheral sensor 20, the second peripheral sensor 30, the third peripheral sensor 40, and an external input and output terminal 75 are connected to the bus line 74.
  • the sound source 76 or a test PC 79 is connected to the external input and output terminal 75.
  • a state in which both the sound source 76 and the test PC 79 are connected is shown.
  • the amplifier 77 is connected to the sound source 76.
  • the speaker 78 is connected to the amplifier 77.
  • the CPU 71 is an arithmetic device for controlling components connected via the bus line 74.
  • the ROM 72 is a non-rewritable memory.
  • a control program 72a In the ROM 72, a control program 72a, a central sensor strike position table 72b, and a peripheral sensor strike position table 72c are stored.
  • an initialization process ( Fig. 7(a) ) is performed.
  • the central sensor strike position table 72b is a table for acquiring a strike position of the electronic drum 1 from a pitch ⁇ Thw of the initial half wave according to an output value of a strike with respect to the central sensor 10.
  • the pitch ⁇ Thw of the initial half wave will be described with reference to Fig. 6(a) .
  • Fig. 6(a) is a voltage and time graph of a voltage waveform (an output waveform from the central sensor 10) based on a strike in the central sensor 10.
  • the vertical axis represents the voltage and the horizontal axis represents the time.
  • a voltage waveform between a time Ts at which a voltage waveform starts based on the strike output from the central sensor 10 and a time Te which is a zero cross point of the voltage waveform immediately thereafter has a negative value. This is because, when the struck surface of the electronic drum is struck, the struck surface "deflects" in a negative direction.
  • a voltage waveform with a negative value output from the time Ts at which detection of the strike starts to the time Te is referred to as an "initial half wave.”
  • the pitch ⁇ Thw of the initial half wave detected by the central sensor 10 that is, a time difference between the time Te and the time Ts, varies according to the distance between the central sensor 10 and the strike position.
  • the pitch ⁇ Thw of the initial half wave becomes larger as the strike position becomes closer to the central sensor 10 and the pitch ⁇ Thw of the initial half wave becomes smaller as the strike position becomes further away from the central sensor 10. This relationship is calculated from measured values and tabulated in the central sensor strike position table 72b.
  • the central sensor strike position table 72b will be described with reference to Fig. 5(a) .
  • Fig. 5(a) is a diagram schematically showing the central sensor strike position table 72b.
  • the central sensor strike position table 72b is a table in which strike positions calculated from the measured values according to the pitch ⁇ Thw of the initial half wave are stored.
  • the pitch ⁇ Thw of the initial half wave calculated from the voltage waveform based on the strike in the central sensor 10 is referred to as the pitch ⁇ Thw of the initial half wave of the central sensor strike position table 72b and the corresponding strike position is acquired.
  • the strike position is calculated and performance information of the electronic drum 1 is generated based on the calculated result.
  • numerical values of the central sensor strike position table 72b are not necessarily limited thereto. According to materials and characteristics of the head 3, the central sensor 10, and the cushion member 14, the arrangement of the central sensor 10, the height of the cushion member 14, and the like, numerical values of the central sensor strike position table 72b may be appropriately set.
  • the peripheral sensor strike position table 72c is a table in which the strike position of the electronic drum 1 is acquired according to strike detection time differences between the first peripheral sensor 20 to the third peripheral sensor 40.
  • the strike detection time differences between the first peripheral sensor 20 to the third peripheral sensor 40 will be described with reference to Fig. 6(b) .
  • Fig. 6(b) is a voltage and time graph of voltage waveforms in the first peripheral sensor 20, the second peripheral sensor 30, and the third peripheral sensor 40 which are detected with respect to a certain strike on the struck surface of the electronic drum 1.
  • the vertical axis represents the voltage and the horizontal axis represents the time.
  • a time at which the peak due to a certain strike is detected by the first peripheral sensor 20 is set as a peak time Tm1. Further, times at which peaks due to the same strike are detected by the second peripheral sensor 30 and the third peripheral sensor 40 are set as a peak time Tm2 and a peak time Tm3.
  • a time difference between the peak time Tm1 and the peak time Tm2 is set as ⁇ T1
  • a time difference between the peak time Tm1 and the peak time Tm3 is set as ⁇ T2.
  • the first peripheral sensor 20, the second peripheral sensor 30, and the third peripheral sensor 40 are disposed at equal intervals at positions of "100" from the center of the struck surface (refer to Fig. 3 ). Therefore, when the center of the struck surface is struck, the detected peak times Tm1, Tm2, and Tm3 are the same. On the other hand, when a portion other than the center of the struck surface is struck, the detected peak times Tm1, Tm2, and Tm3 vary according to the strike position. That is, ⁇ T1 and ⁇ T2 vary according to the strike position.
  • the strike position is calculated from the measured values.
  • the calculated values are tabulated in the peripheral sensor strike position table 72c.
  • the peripheral sensor strike position table 72c will be described with reference to Fig. 5(b) .
  • Fig. 5(b) is a diagram schematically showing the peripheral sensor strike position table 72c.
  • the peripheral sensor strike position table 72c is a table in which strike positions calculated from the measured values according to the time differences ⁇ T1 and ⁇ T2 of the peak of the strike between the first peripheral sensor 20, and the second peripheral sensor 30 and the third peripheral sensor 40 are stored.
  • the time differences ⁇ T1 and ⁇ T2 of the peak of the strike are referred to as the time differences ⁇ T1 and ⁇ T2 of the peripheral sensor strike position table 72c and the corresponding strike position is acquired. Therefore, the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 can be acquired more quickly than when the strike position is calculated from the time differences ⁇ T1 and ⁇ T2 of the peak of each strike.
  • a strike position is calculated and performance information of the electronic drum 1 is generated based on the calculated result.
  • the time differences ⁇ T1 and ⁇ T2 of the peak of the strike when a position (a position A) of the first peripheral sensor 20 is struck have the same value as the time differences ⁇ T1 and ⁇ T2 of the peak of the strike when a position on the outer peripheral side of the first peripheral sensor 20 along an extension line connecting the position A and the center of the struck surface is struck.
  • the peripheral sensor strike position table 72c also, according to the time differences ⁇ T1 and ⁇ T2, at a storage position when a position is on the outer peripheral side relative to the first peripheral sensor 20 to the third peripheral sensor 40, the same "100" as in the positions of the first peripheral sensor 20 to the third peripheral sensor 40 is stored.
  • numerical values of the peripheral sensor strike position table 72c are not necessarily limited thereto. According to materials and characteristics of the head 3, the first peripheral sensor 20 to the third peripheral sensor 40, and the cushion member 24, and an arrangement of the first peripheral sensor 20 to the third peripheral sensor 40, and the height of the cushion member 24, and the like, numerical values of the peripheral sensor strike position table 72c are appropriately set.
  • strike positions are calculated based on absolute values of the time differences ⁇ T1 and ⁇ T2.
  • the strike positions may be calculated by including positive and negative signs of the time differences ⁇ T1 and ⁇ T2. That is, the calculated strike positions (distances from the central sensor 10) may be different according to the positive and negative signs of the time differences ⁇ T1 and ⁇ T2 of the peak of the strike.
  • the RAM 73 is a rewritable memory in which various types of work data, flags, and the like used when the CPU 71 executes a program such as the control program 72a can be stored.
  • a sensor value memory 73a a sensor value ring buffer 73b, a sensor peak value memory 73c, a central sensor scan flag 73d, a peripheral sensor scan flag 73e, a central sensor strike position gain memory 73f, a central sensor strike position memory 73g, a peripheral sensor strike position memory 73h, a strike position memory 73i, a velocity memory 73j, and a test mode flag 73k are provided.
  • the sensor value memory 73a is a memory in which A/D converted sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 (with no unit) are stored. Although not shown, in the sensor value memory 73a, sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are stored separately. The values in the sensor value memory 73a are initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed. Then, in a periodic process in Fig. 8 , sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are stored in the corresponding sensor value memory 73a when the periodic process is performed ( Fig. 8 , S10).
  • the sensor value ring buffer 73b is a buffer in which values for the past 5 ms of A/D converted sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are stored.
  • the sensor value ring buffer 73b will be described with reference to Fig. 5(c) .
  • Fig. 5(c) is a diagram schematically showing the sensor value ring buffer 73b.
  • the sensor value ring buffer 73b comprises a central sensor value memory 73b1, a first peripheral sensor value memory 73b2, a second peripheral sensor value memory 73b3, and a third peripheral sensor value memory 73b4.
  • Each of the sensor output values of the sensors is stored in the corresponding memory.
  • the central sensor value memory 73b1 is a memory in which A/D converted sensor output values of the central sensor 10 (with no unit) are stored.
  • the first peripheral sensor value memory 73b2 to the third peripheral sensor value memory 73b4 are memories in which A/D converted sensor output values (with no unit) of the first peripheral sensor 20 to the third peripheral sensor 40 are stored.
  • the central sensor value memory 73b1 and the first peripheral sensor value memory 73b2 to the third peripheral sensor value memory 73b4 are initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed. Then, in the periodic process in Fig. 8 , sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40are added to the corresponding central sensor value memory 73b1 and first peripheral sensor value memory 73b2 to third peripheral sensor value memory 73b4 when the periodic process is performed ( Fig. 8 , S10).
  • the sensor value ring buffer 73b a memory in which 50 sensor output values are stored is provided. This is because, the periodic process (to be described below) in Fig. 8 is performed every 100 microseconds (hereinafter referred to as " ⁇ s") and sensor output values for the past 5 ms are stored.
  • ⁇ s the periodic process (to be described below) in Fig. 8 is performed every 100 microseconds (hereinafter referred to as " ⁇ s") and sensor output values for the past 5 ms are stored.
  • ⁇ s the periodic process (to be described below) in Fig. 8 is performed every 100 microseconds (hereinafter referred to as " ⁇ s") and sensor output values for the past 5 ms are stored.
  • ⁇ s the periodic process (to be described below) in Fig. 8 is performed every 100 microseconds (hereinafter referred to as " ⁇ s") and sensor output values for the past 5 ms are stored.
  • the sensor value ring buffer 73b first, acquired sensor output values are stored in the order of No
  • the sensor peak value memory 73c is a memory in which peaks (maximum absolute values) of the sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are stored. Although not shown, in the sensor peak value memory 73c, peaks of sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are stored separately. The values of the sensor peak value memory 73c are initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed. Then, in the periodic process in Fig.
  • the central sensor scan flag 73d is a flag indicating that the time is within the scan time of the central sensor 10 that is a waiting process of 2 ms.
  • the central sensor scan flag 73d is set to off, which indicates that the time is not within the scan time of the central sensor 10.
  • the central sensor scan flag 73d is set to on ( Fig. 8 , S17).
  • the central sensor scan flag 73d is set to off ( Fig. 9 , S31).
  • the peripheral sensor scan flag 73e is a flag indicating that the time is within the scan time of the peripheral sensor that is a waiting process of 2 ms.
  • the peripheral sensor scan flag 73e is set to off, which indicates that the time is not within the scan time of the peripheral sensor.
  • the peripheral sensor scan flag 73e is set to on ( Fig. 8 , S20). Then, in a peripheral sensor striking process in Fig.
  • the peripheral sensor scan flag 73e when the scan time of the first peripheral sensor 20 to the third peripheral sensor 40 ends, the peripheral sensor scan flag 73e is set to off ( Fig. 10 , S51). In addition, while the peripheral sensor scan flag 73e is in an on state, when a strike is detected by the central sensor 10, the peripheral sensor scan flag 73e is set to off ( Fig. 8 , S24). As will be described below, this is because, within the scan time of the peripheral sensor, when a strike is detected by the central sensor 10, the scan time of the peripheral sensor is stopped and the scan time of the central sensor 10 starts again. Then, after the scan time of the central sensor 10, a strike position and a velocity are calculated according to the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40.
  • the central sensor strike position gain memory 73f is a memory in which weight coefficients with respect to strike positions for the central sensor 10, which are used when the strike position is calculated, are stored.
  • the central sensor strike position gain memory 73f is initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed. Then, in the central sensor striking process in Fig. 9 , when the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is "75" or more, "0.5” is set in the central sensor strike position gain memory 73f.
  • "75” is a threshold value indicating whether the strike position is calculated based on only strike positions detected by the first peripheral sensor 20 to the third peripheral sensor 40.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is smaller than "75,” "0" is set in the central sensor strike position gain memory 73f ( Fig. 9 , S38, S39). Then, values in the central sensor strike position gain memory 73f are used as weight coefficients for the strike position for the central sensor 10 (that is, values in the central sensor strike position memory 73g to be described below). Then, the strike position is calculated by combining a value obtained by multiplying a strike position for the central sensor 10 by a weight coefficient and a strike position for the first peripheral sensor 20 to the third peripheral sensor 40 (that is, a value of the peripheral sensor strike position memory 73h).
  • the central sensor strike position memory 73g is a memory in which the strike position acquired by the central sensor 10 is stored.
  • the central sensor strike position memory 73g is initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed. Then, in the central sensor striking process in Fig. 9 , the central sensor strike position table 72b is referred to according to the calculated pitch ⁇ Thw of the initial half wave of the central sensor 10 from the sensor value ring buffer 73b, and the acquired strike position is stored in the central sensor strike position memory 73g ( Fig. 9 , S34).
  • the peripheral sensor strike position memory 73h is a memory in which the strike positions acquired by the first peripheral sensor 20 to the third peripheral sensor 40 are stored.
  • the peripheral sensor strike position memory 73h is initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed.
  • the peripheral sensor strike position table 72c is referred to according to the calculated time difference ⁇ T1 between peaks of the first peripheral sensor 20 and the second peripheral sensor 30 and time difference ⁇ T2 between peaks of the first peripheral sensor 20 and the third peripheral sensor 40 from the sensor value ring buffer 73b.
  • the acquired strike position is stored in the peripheral sensor strike position memory 73h ( Fig. 9 , S36).
  • the strike position memory 73i is a memory in which strike positions calculated based on detection results of the strike on the struck surface of the electronic drum 1 are stored.
  • the strike position memory 73i is initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed.
  • a strike position is calculated based on the strike position for the central sensor 10 and the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 ( Fig. 9 , S40).
  • a value stored in the strike position memory 73i is not necessarily limited to "100” and any value in the range of "100” to "127" may be stored.
  • the velocity memory 73j is a memory in which velocities (strike strengths) calculated based on detection results of a strike on the struck surface of the electronic drum 1 are stored.
  • the velocity memory 73j is initialized to "0" when the electronic drum 1 is powered on and immediately after the initialization process in Fig. 7(a) is performed.
  • the calculated velocity is stored in the velocity memory 73j ( Fig. 9 , S33).
  • the calculated velocity is stored in the velocity memory 73j ( Fig. 10 , S55). Then, the instruction for generating a musical sound according to a value in the velocity memory 73j and a value in the strike position memory 73i is issued to the sound source 76 (to be described below) ( Fig. 9 , S41, Fig. 10 , S55).
  • the test mode flag 73k is a flag indicating that the electronic drum 1 is in a test mode.
  • the test mode flag 73k is set to off, which indicates the mode is not the test mode.
  • the test mode flag 73k is set to on ( Fig. 7(b) , S3).
  • the electronic drum 1 in the test mode transmits a MIDI System Exclusive Message including the detected sensor output values, which are, values in the sensor peak value memory 73c, through the external input and output terminal 75 (to be described below).
  • a MIDI system Exclusive Message will be referred to as "SysEx" below.
  • the test PC 79 (to be described below) connected to the external input and output terminal 75 analyzes the received SysEx message and determines whether the sensors are operating normally based on the sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 comprised in the message.
  • the external input and output terminal 75 is an interface for transmitting and receiving data between the electronic drum 1 and the sound source 76, the test PC 79, and another computer.
  • the sound source 76 and the test PC 79 will be described below.
  • the instruction for generating a musical sound generated by the electronic drum 1 is transmitted to the sound source 76 through the external input and output terminal 75.
  • the SysEx message including values in the sensor peak value memory 73c is transmitted to the test PC 79 through the external input and output terminal 75.
  • the SysEx message from the test PC 79 is received through the external input and output terminal 75.
  • the sound source 76 is a device configured to control tones of a musical sound (a striking sound) and various effects according to an instruction from the CPU 71.
  • a digital signal processor (DSP) 76a configured to perform computation processes such as filtering and effects on waveform data is built into the sound source 76.
  • the musical sound processed by the sound source 76 is output as an analog musical sound signal.
  • the amplifier 77 is a device configured to amplify the analog musical sound signal output from the sound source 76 and output the amplified analog musical sound signal to the speaker 78.
  • the speaker 78 produces (outputs) the analog musical sound signal amplified by the amplifier 77 as a musical sound.
  • the test PC 79 is a computer for analyzing the sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 comprised in the SysEx message received from the electronic drum 1 in the test mode.
  • the test PC 79 transmits the SysEx message including the message for switching to the test mode to the electronic drum 1 through the external input and output terminal 75.
  • the electronic drum 1 transitions to the test mode.
  • a SysEx message including values in the sensor peak value memory 73c is transmitted to the test PC 79.
  • test PC 79 analyzes the received SysEx message including values in the sensor peak value memory 73c using an inspection fixture application that the test PC 79 executes. Then, it is determined whether the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are operating normally.
  • Fig. 7(a) is a flowchart of the initialization process. The initialization process is performed immediately after the electronic drum 1 is powered on and memory values and flags in the RAM 73 are initialized (S1).
  • the MIDI reception process is performed according to an interrupt process that is performed with the reception of MIDI data as a trigger through the external input and output terminal 75.
  • Fig. 7(b) is a flowchart of the MIDI reception process.
  • the MIDI reception process first, the received MIDI data is analyzed and it is checked whether the result is a message for switching to the test mode (S2).
  • the test mode flag 73k is set to on (S3).
  • the process of S3 is skipped.
  • the MIDI reception process ends. Therefore, when the MIDI data received from the test PC 79 is the message for switching to the test mode, the electronic drum 1 transitions to the test mode.
  • the electronic drum 1 detects a strike, after 320 ms, the electronic drum 1 transmits the SysEx message including values in the sensor peak value memory 73c to the test PC 79.
  • the test mode flag 73k which has been set to on continues to be in an on state until the electronic drum 1 is powered off.
  • the test mode flag 73k is set to off in the process of S1 in Fig. 7(a) immediately after the electronic drum 1 is powered on next time.
  • the periodic process performed in the CPU 71 of the electronic drum 1 will be described with reference to Fig. 8 to Fig. 10 .
  • the sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 when the periodic process is performed are acquired.
  • the central sensor striking process ( Fig. 9 ) or the peripheral sensor striking process ( Fig. 10 ) in which a strike position and a velocity are calculated and an instruction for generating a musical sound is issued is performed.
  • the periodic process is repeatedly performed every 100 ⁇ s according to an interval interrupt process every 100 ⁇ s.
  • Fig. 8 is a flowchart of the periodic process.
  • the sensor output values of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 are acquired.
  • the acquired sensor output value is stored in the sensor value memory 73a and is added to the sensor value ring buffer 73b (S10).
  • No. 1 in Fig. 5(c) indicates a first storage position of a sensor output value. Thereafter, the storage position moves in ascending order of No. 2, No. 3..., and the sensor output values are stored in these areas.
  • a value is stored in No. 1 again.
  • values in the sensor value memory 73a and values in the sensor value ring buffer 73b are updated every 100 ⁇ s.
  • the central sensor scan flag 73d is set to on and measurement of the scan time starts from 0 (S17). Thereafter, the scan time is measured whenever the periodic process is performed. Therefore, measurement of "the scan time of the central sensor 10" starts.
  • the peripheral sensor scan flag 73e is set to on and measurement of the scan time starts from 0 (S20). Thereafter, the scan time is measured whenever the periodic process is performed. Therefore, measurement of "the scan time of the peripheral sensor" starts.
  • the center of the struck surface has a larger amount of deformation (an amount of deflection) of the struck surface than the peripheral portions of the struck surface. Therefore, the central sensor 10 disposed at the center of the struck surface has a wider range of sensor output values with respect to a strike and more favorable strike detection sensitivity than the first peripheral sensor 20 to the third peripheral sensor 40 disposed at the peripheral portions of the struck surface. Therefore, in cases in which the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike earlier than the central sensor 10, as long as the central sensor 10 detects the strike within the scan time of the peripheral sensors, the scan time of the central sensor 10 starts.
  • the velocity is calculated based on results of detecting a strike by the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, in cases in which the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike earlier than the central sensor 10, and in cases in which the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike later than the central sensor 10, the velocity can be calculated using detection results of the central sensor 10 with high sensitivity.
  • an instruction for generating a musical sound is delayed for a time from when the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike until the central sensor 10 detects the strike.
  • a period for which it is determined whether the central sensor 10 detects a strike is within the scan time of the peripheral sensor from when the first peripheral sensor 20 to the third peripheral sensor 40 detect the strike. Therefore, a delay time of the instruction for generating a musical sound can be limited within the scan time of the peripheral sensor (that is, 2 ms). That is, a delay time of the instruction for generating a musical sound can be limited within a range of a design value by adjusting a measurement time of the scan time of the peripheral sensor.
  • a strike position and a velocity are calculated from the values in the sensor peak value memory 73c and the values in the sensor value ring buffer 73b of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, an instruction for generating a musical sound according to the strike position and the velocity is issued to the sound source 76, and a musical sound of the electronic drum 1 is generated.
  • the central sensor striking process it is checked whether the scan time is 2 ms or more (S30).
  • the scan time of the central sensor 10, that is 2 ms after the central sensor 10 detects a strike is a so-called "waiting process" in which output values of the sensors according to the strike are monitored and a strike position and a velocity according to the strike are not calculated.
  • the central sensor striking process it is checked whether the scan time has elapsed.
  • the scan time of the central sensor 10 ends. Therefore, the central sensor scan flag 73d indicating that the time is within the scan time of the central sensor 10 is set to off, and measurement of the scan time is stopped (S31).
  • test mode flag 73k is in an off state (S32). That is, it is checked whether the electronic drum 1 is in the test mode.
  • test mode flag 73k is an off state (Yes in S32)
  • weighted computation of the values in the sensor peak value memory 73c of the central sensor 10 and the values in the sensor peak value memory 73c of the first peripheral sensor 20 to the third peripheral sensor 40 is performed.
  • the results are stored in the velocity memory 73j (S33). That is, in the central sensor striking process, a velocity (a strike strength) according to the strike is calculated by weighted computation of the peak values of the sensors.
  • a velocity VI is calculated from weighted computation in Equation 1.
  • V 1 peak _ c * gain _ c + peak _ s 1 * gain _ s 1 + peak _ s 2 * gain _ s 2 + peak _ s 3 * gain _ s 3 * gain _ Mix _ v
  • gain_c, gain_s1, gain_s2, and gain_s3 are gain constants, which are "0.3,” “0.2,” “0.2,” and “0.2.”
  • gain_Mix_v is a value set by a user and is a value set by an input device (not shown) of the electronic drum 1.
  • the velocity VI calculated in Equation 1 is stored in the velocity memory 73j.
  • the gain constants are not necessarily limited to the above-described values, and may be appropriately set according to a size and a material of the struck surface, sensitivity of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40, and the like.
  • an initial half wave according to the strike in the central sensor 10 is acquired from the values in the sensor value ring buffer 73b.
  • the central sensor strike position table 72b is referred to according to the pitch ⁇ Thw of the initial half wave and the corresponding strike position is stored in the central sensor strike position memory 73g (S34).
  • a position at which the value is a minimum is acquired with reference to the values in the central sensor value memory 73b1 of the sensor value ring buffer 73b.
  • the values in the central sensor value memory 73b1 of the sensor value ring buffer 73b are referred to in the backward direction from the position, and a position at which the value is 0 is acquired. That is, this time is the time Ts in Fig. 6(a) .
  • the central sensor strike position table 72b is referred to according to a time difference between the time Ts and the time Te, that is, a value of the pitch ⁇ Thw of the initial half wave, and the corresponding strike position is stored in the central sensor strike position memory 73g.
  • a detection time of the strike in the first peripheral sensor 20 to the third peripheral sensor 40 is acquired from the values in the sensor value ring buffer 73b (S35). Specifically, a position at which the value is a minimum (that is, "No.” in Fig. 5(c) ) is acquired with reference to the values in the first peripheral sensor value memory 73b2, the second peripheral sensor value memory 73b3, and the third peripheral sensor value memory 73b4 of the sensor value ring buffer 73b. Then, when a difference between the position and a current storage position (that is, a storage position stored in S10 in Fig. 8 ) in the sensor value ring buffer 73b is multiplied by 100 ⁇ s, times at which the values are minimum, which are, peak times Tm1, Tm2, and Tm3 in Fig. 6(b) , are calculated.
  • the peripheral sensor strike position table 72c is referred to according to a time difference ⁇ T1 between the peak times Tm1 and Tm2 and a time difference ⁇ T2 between the peak times Tm1 and Tm3, and the corresponding strike position is stored in the peripheral sensor strike position memory 73h (S36).
  • the strike position is acquired accurately according to a strike detection time difference between the first peripheral sensor 20 to the third peripheral sensor 40 described in the process of S35. This is because detection of the strike by the first peripheral sensor 20 to the third peripheral sensor 40 is earlier than complete detection of the pitch ⁇ Thw of the initial half wave by the central sensor 10. Accordingly, when a strike position (that is, the value in the peripheral sensor strike position memory 73h) according to a strike detection time difference between the first peripheral sensor 20 to the third peripheral sensor 40 is less than "75" (that is, when it is close to the vicinity of the center of the struck surface of the electronic drum 1), "0" is set in the central sensor strike position gain memory 73f.
  • the strike position for the central sensor 10 is not considered. Accordingly, when the vicinity of the center of the struck surface of the electronic drum 1 is struck and there is a possibility that the strike position cannot be accurately acquired by the central sensor 10, a strike position is calculated using only the strike position acquired by the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, it is possible to acquire the strike position accurately.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is accurately calculated when the position is less than "100.” Accordingly, when the strike position is calculated using the strike position for the central sensor 10 and the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 in combination, it is possible to acquire the strike position with higher accuracy.
  • the value in the central sensor strike position gain memory 73f set in this case is not necessarily limited to "0.5,” and may be appropriately set according to a size, a material, and the like of the struck surface.
  • the strike position is calculated according to weighted computation of the value in the central sensor strike position memory 73g, the value in the peripheral sensor strike position memory 73h, and the value in the central sensor strike position gain memory 73f. Then, the calculated strike position is stored in the strike position memory 73i (S40).
  • pre_gain_c is the value in the central sensor strike position gain memory 73f.
  • "(1-pre_gain_c)" is a weight coefficient for the strike position for the first peripheral sensor 20 to the third peripheral sensor 40.
  • gain_Mix_p is a value set by a user, and is a value set by the input device (not shown) of the electronic drum 1.
  • the strike position Ps calculated in Equation 2 is stored in the strike position memory 73i. After the process of S40, an instruction for generating a musical sound according to the value in the strike position memory 73i and the value in the velocity memory 73j is output to the sound source 76 (S41).
  • the peripheral sensor striking process ( Fig. 8 , S26) that is performed when the central sensor 10 does not detect a strike within the scan time of the peripheral sensor such as a case in which the outer peripheral side of the struck surface is weakly struck will be described with reference to Fig. 10 .
  • a strike position and a velocity are calculated from the values in the sensor value ring buffer 73b of the first peripheral sensor 20 to the third peripheral sensor 40.
  • the strike position in this case is set to "100 (fixed value)" (refer to Fig. 3 ).
  • an instruction for generating a musical sound according to the strike position and the velocity is issued to the sound source 76, and a musical sound of the electronic drum 1 is generated.
  • the scan time is 2 ms or more (S50).
  • the scan time of the peripheral sensor that is 2 ms after the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike is a so-called "waiting process" in which output values of the sensors according to the strike are monitored and a strike position and a velocity according to the strike are not calculated. Accordingly, it is checked whether the scan time has elapsed.
  • the peripheral sensor scan flag 73e indicating that the time is within the scan time of the first peripheral sensor 20 to the third peripheral sensor 40 is set to off, and measurement of the scan time is stopped (S51). After the process of S51, it is checked whether the test mode flag 73k is in an off state (S52). When the test mode flag 73k is an off state (Yes in S52), weighted computation of the values in the sensor peak value memory 73c of the first peripheral sensor 20 to the third peripheral sensor 40 is performed. Then, the results are stored in the velocity memory 73j (S53).
  • a velocity (a strike strength) according to the strike is calculated according to weighted computation of the peak values of the first peripheral sensor 20 to the third peripheral sensor 40.
  • the velocity VI is calculated according to weighted computation in Equation 3.
  • V 1 peak _ s 1 * gain _ s 1 + peak _ s 2 * gain _ s 2 + peak _ s 3 * gain _ s 3 * gain _ Mix _ v
  • gain_s1, gain_s2, and gain_s3 are gain constants, which are “0.2,” “0.2,” and “0.2.”
  • the gain constants are not necessarily limited to the above-described values, and may be appropriately set according to a size and a material of the struck surface, the detection sensitivities of the first peripheral sensor 20 to the third peripheral sensor 40, and the like.
  • gain Mix v is a value set by a user and is a value set by the input device (not shown) of the electronic drum 1.
  • gain _Mix_v is not limited to the same value as in gain Mixv in Equation 1, and another value may be set.
  • S54 "100" is stored in the strike position memory 73i (S54).
  • Conditions in which S54 is performed comprise that the peripheral sensor scan flag 73e being in an on state ( Fig. 8 , Yes in S12), the central sensor 10 does not detect a strike ( Fig. 8 , No in S22), and the scan time being 2 ms or more (Yes in S50). That is, a strike is detected in any of the first peripheral sensor 20 to the third peripheral sensor 40, but the central sensor 10 does not detect the strike within the scan time. In other words, the struck surface of the electronic drum 1 is weakly struck at the peripheral portion of the struck surface.
  • the strike position is accurately calculated from the time differences ⁇ T1 and ⁇ T2 of the peak of the strike.
  • the strike position is not accurately calculated from the time differences ⁇ T1 and ⁇ T2 of the peak of the strike and the positions of the first peripheral sensor 20 to the third peripheral sensor 40 are set as strike positions.
  • the central sensor 10 since the central sensor 10 does not detect the strike, it is not possible to calculate the strike position from the pitch ⁇ Thw of the initial half wave of the central sensor 10. Therefore, in the present embodiment, in order to simplify the process, when a strike is detected in any of the first peripheral sensor 20 to the third peripheral sensor 40 but the central sensor 10 does not detect the strike, the strike position is set to the position "100" the same as those of the first peripheral sensor 20 to the third peripheral sensor 40, and the strike position is used for an instruction for generating a musical sound.
  • the central sensor 10 does not detect a strike within the scan time of the peripheral sensor such as a case in which the peripheral portion of the struck surface is weakly struck to an extent that the central sensor 10 is not able to detect the strike
  • the weak strike is detected by the first peripheral sensor 20 to the third peripheral sensor 40 and an instruction for generating a musical sound is issued. That is, after the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike, when the central sensor 10 does not detect the strike within the scan time of the peripheral sensor, an instruction for generating a musical sound is issued without waiting for detection of the strike by the central sensor 10. Accordingly, in this case, an instruction for generating a musical sound is not delayed.
  • a strike position is calculated using only the strike position for the first peripheral sensor 20 to the third peripheral sensor 40. That is, in Equation 2, pre_gain_c (the value in the central sensor strike position gain memory 73f) is set to "0.” Then, when the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is 75 to 100, it is a range in which a strike position is detected using the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 together.
  • pre_gain_c (the value in the central sensor strike position gain memory 73f) is set to "0.5.”
  • the value of pre_gain_c set in this case is not necessarily limited to "0.5” and may be appropriately set according to a size, a material, and the like of the struck surface.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 when the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is 100 or more, it indicates a position on the outer peripheral side relative to the positions (the position of "100" in Fig. 3 ) of the first peripheral sensor 20 to the third peripheral sensor 40.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 when the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is a position on the outer peripheral side relative to the first peripheral sensor 20 to the third peripheral sensor 40, the position is "100" the same as those of the first peripheral sensor 20 to the third peripheral sensor 40.
  • a strike position is calculated according to weighted computation of both positions.
  • an instruction for generating a musical sound is issued after the scan time of the central sensor 10, which is 2 ms.
  • an instruction for generating a musical sound is issued after the scan time of the peripheral sensor, which is 2 ms.
  • the present embodiment is different from the related art in that the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike before the central sensor 10 detects a strike. Accordingly, a strike position and a velocity are calculated after the scan time of the central sensor 10 and/or the scan time of the peripheral sensor from when the central sensor 10 or the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike, that is, after a maximum of 4 ms. Therefore, an instruction for generating a musical sound is not delayed. Accordingly, it is possible to play the electronic drum 1 having favorable responsiveness to a strike.
  • the electronic drum 1 in the present embodiment comprises the central sensor 10 disposed at the center of the struck surface and the first peripheral sensor 20 to the third peripheral sensor 40 disposed at the peripheral portions of the struck surface.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at equal intervals along the circumference centered on the central sensor 10.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions at which, whichever position inside the circumference is struck, all of the first peripheral sensor 20 to the third peripheral sensor 40 can detect the strike within the scan time of the central sensor 10, that is 2 ms after the central sensor 10 detects the strike.
  • a velocity (a strike strength) and a strike position according to sensor output values detected by the sensors according to the strike on the struck surface of the electronic drum 1 are calculated. Therefore, an instruction for generating a musical sound is issued based on the calculated velocity and strike position.
  • the velocity is calculated based on the peak of the strike detected by the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40. Specifically, when the central sensor 10 detects a strike earlier than the first peripheral sensor 20 to the third peripheral sensor 40 according to the strike on the struck surface of the electronic drum 1, the scan time of the central sensor 10 is measured from when the central sensor 10 detects the strike. Then, after the scan time ends, a velocity is calculated based on the peak of the strike detected by the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40.
  • the velocity is calculated based on the peak of the strike detected by the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40. Therefore, a distribution of strike sensitivities of the struck surface can be substantially uniformized so that a so-called hotspot in which a striking sound becomes abnormally loud in a central portion of the struck surface in which the central sensor 10 is provided can be removed.
  • a strike detection time difference between the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 may increase as a result.
  • the central sensor 10 does not detect a strike within the scan time of the peripheral sensor such as a case in which the peripheral portion of the struck surface is weakly struck to an extent that the central sensor 10 is not able to detect the strike
  • the weak strike is detected by the first peripheral sensor 20 to the third peripheral sensor 40, and an instruction for generating a musical sound is issued. That is, after the first peripheral sensor 20 to the third peripheral sensor 40 detect a strike, when the central sensor 10 does not detect the strike within the scan time of the peripheral sensor, an instruction for generating a musical sound is issued without waiting for detection of the strike by the central sensor 10. Accordingly, in this case, an instruction for generating a musical sound is not delayed.
  • a strike position is calculated based on the strike position from the central sensor 10 and the strike position from the first peripheral sensor 20 to the third peripheral sensor 40.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 of the electronic drum 1 is calculated with reference to the peripheral sensor strike position table 72c according to a difference ⁇ T1 in times at which the peaks of the first peripheral sensor 20 and the second peripheral sensor 30 are detected and a difference ⁇ T2 in times at which the peaks of the first peripheral sensor 20 and the third peripheral sensor 40 are detected.
  • the strike position for the central sensor 10 is calculated with reference to the central sensor strike position table 72b according to the pitch ⁇ Thw of the initial half wave of the strike detected by the central sensor 10.
  • a strike position is calculated according to weighted computation of the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 and the strike position for the central sensor 10.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions at which, whichever position inside the circumference is struck, all of the first peripheral sensor 20 to the third peripheral sensor 40 can detect the strike within the scan time of the central sensor 10, that is 2 ms after the central sensor 10 detects the strike. Then, detection of the strike by the first peripheral sensor 20 to the third peripheral sensor 40 is performed within the scan time of the central sensor 10, and a strike position in the circumference in which the first peripheral sensor 20 to the third peripheral sensor 40 are disposed can be calculated by the first peripheral sensor 20 to the third peripheral sensor 40. On the other hand, a strike position of the peripheral portion of the struck surface is calculated based on the pitch ⁇ Thw of the initial half wave detected by the central sensor 10.
  • a strike position is calculated depending on a strike position indicated by the strike position calculated by the first peripheral sensor 20 to the third peripheral sensor 40, according to weighted computation of the strike position obtained from the first peripheral sensor 20 to the third peripheral sensor 40 and the strike position obtained from the central sensor 10, a strike position is calculated. Since the strike position is calculated according to the weighted computation, it is possible to calculate the strike position more accurately.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions (positions of "100" in Fig. 3 ) at which, when the struck surface is struck, peaks due to the same strike can be detected by all of the first peripheral sensor 20 to the third peripheral sensor 40 within the scan time of the central sensor 10, that is 2 ms after the central sensor 10 detects the strike. Therefore, detection by the first peripheral sensor 20 to the third peripheral sensor 40 is performed within the scan time of the central sensor 10, and the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 in the circumference in which the first peripheral sensor 20 to the third peripheral sensor 40 are disposed can be calculated. On the other hand, the strike position for the central sensor 10 is calculated based on the pitch ⁇ Thw of the initial half wave detected by the central sensor 10.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at positions at which, when the struck surface is struck, the pitch ⁇ Thw of the initial half wave can be detected within the scan time of the central sensor 10 after the central sensor 10 detects the strike. Therefore, when a position outside the circumference is struck, the central sensor 10 can detect the pitch ⁇ Thw of the initial half wave within the scan time of the central sensor 10 and the strike position for the central sensor 10 is calculated based on the detected result. Therefore, a strike position is calculated according to weighted computation of the strike position for the central sensor 10 and the strike position for the first peripheral sensor 20 to the third peripheral sensor 40.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is the vicinity of the center of the struck surface of the electronic drum 1 (that is, a position of "75" or less)
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is set as a strike position. Accordingly, even if it is not possible for the central sensor 10 to completely detect the pitch ⁇ Thw of the initial half wave, it is possible to calculate the strike position within the scan time of the central sensor 10.
  • the strike position in the circumference is calculated with reference to the peripheral sensor strike position table 72c according to the time difference ⁇ T1 between the peaks of the first peripheral sensor 20 and the second peripheral sensor 30 and the time difference ⁇ T2 between the peaks of the first peripheral sensor 20 and the third peripheral sensor 40.
  • a strike position outside the circumference is calculated with reference to the central sensor strike position table 72b according to the pitch ⁇ Thw of the initial half wave detected by the central sensor 10. Accordingly, a strike position inside or outside the circumference can be calculated based on the result of detection of the strike within the scan time of the central sensor 10. Therefore, even if the struck surface is formed in a large size, it is possible to quickly calculate the strike position. That is, an instruction for generating a musical sound is not delayed.
  • the central sensor 10 When only the central sensor 10 is used in order to detect a strike strength (a velocity), a so-called hotspot is generated in the vicinity of the center of the struck surface. In addition, when the peripheral portion of the struck surface is weakly struck, there is a risk that the strike is not detected. In order to eliminate the risk, the first peripheral sensor 20 to the third peripheral sensor 40 are added in the present embodiment.
  • the first peripheral sensor 20 to the third peripheral sensor 40 when only the first peripheral sensor 20 to the third peripheral sensor 40 are used in order to detect a strike position, it is not possible to detect a strike position on the outer peripheral side relative to the first peripheral sensor 20 to the third peripheral sensor 40.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are arranged on the outermost periphery of the struck surface, it takes a long time for all of the first peripheral sensor 20 to the third peripheral sensor 40 to detect a strike and an instruction for generating a musical sound is delayed.
  • the peripheral sensors are arranged on the inner circumference side in order to reduce the delay, it is not possible to detect a strike position on the outer peripheral side relative to the first peripheral sensor 20 to the third peripheral sensor 40.
  • the central sensor 10 when used in addition to the first peripheral sensor 20 to the third peripheral sensor 40, it is possible to detect a strike position of the peripheral portion (that is, on the outer peripheral side relative to the first peripheral sensor 20 to the third peripheral sensor 40) of the struck surface while reducing the delay of an instruction for generating a musical sound.
  • the electronic drum 1 has been described as an exemplary electronic percussion instrument in the above embodiment. However, the present invention is not necessarily limited thereto, and may be applied for the simulation of other percussion instruments such as a bass drum, a snare drum, a tom-tom drum, and a cymbal.
  • the cushion member 24 of the first peripheral sensor 20 to the third peripheral sensor 40 is formed of the same elastic material as the cushion member 14 of the central sensor 10 has been described in the above embodiment.
  • the present invention is not necessarily limited thereto.
  • the cushion member 24 is formed of an elastic material such as sponge, rubber, and a thermoplastic elastomer
  • an elastic material having higher hardness than the cushion member 14 is preferably used. Accordingly, when the central portion of the struck surface is struck, a time from when the central sensor 10 detects the strike until the first peripheral sensor 20 to the third peripheral sensor 40 detect the strike can be shortened. Therefore, a delay time of sound production control can be shortened.
  • the thickness of the cushion member 24 of the first peripheral sensor 20 to the third peripheral sensor 40 is less than the thickness of the cushion member 14 of the central sensor 10 (an interval between the head sensor 23 and the struck surface is shortened) has been described in the above embodiment. Therefore, it is possible to shorten a time until the head sensor 23 of the first peripheral sensor 20 to the third peripheral sensor 40 detects a strike.
  • the present invention is not necessarily limited thereto.
  • the cushion member 14 and the cushion member 24 may be formed to have the same thickness (alternatively, the thickness of the cushion member 24 may be greater than the thickness of the cushion member 14).
  • the cushion member 24 when the hardness of the material of the cushion member 24 is increased (the cushion member 24 is formed of a material in which vibration due to a strike is rapidly transmitted), a time until the head sensor 23 of the first peripheral sensor 20 to the third peripheral sensor 40 detects the strike can be shortened. That is, at least the first peripheral sensor 20 to the third peripheral sensor 40 may be configured to transmit a strike signal in a shorter time than the central sensor 10 when the struck surface is struck, and a method thereof is not limited.
  • a time from when the central sensor 10 detects the strike until the first peripheral sensor 20 to the third peripheral sensor 40 detect the strike can be shortened. Therefore, a delay time of sound production control can be shortened (a delay of an instruction for generating a musical sound can be shortened).
  • the cushion member 14 and the cushion member 24 are formed of the same elastic material and only the hardness of the cushion member 24 is increased, this is more preferable. Therefore, even if there is a difference between the hardnesses of the cushion member 14 and the cushion member 24 (compared to when both the hardness and the material are different), characteristics (such as a waveform, a level, and a response time) of strike outputs in the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 can be easily matched.
  • the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 comprise a piezoelectric element.
  • the present invention is not necessarily limited thereto.
  • a sensor capable of detecting a strike on the struck surface such as an acceleration sensor and a pressure sensor can be applied as the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40.
  • the struck surface may be formed in a rectangular shape, a polygonal shape, or a shape in which curved lines and straight lines are combined. That is, regardless of the shape of the struck surface, as in the present embodiment, one central sensor 10 and at least three peripheral sensors (first peripheral sensor 20 to the third peripheral sensor 40) disposed at equal intervals along the circumference centered on the central sensor 10 may be arranged in a region that is formed as the struck surface.
  • a strike position in the circumference in which the first peripheral sensor 20 to the third peripheral sensor 40 are disposed can be detected from a time difference between the peaks detected by the first peripheral sensor 20 to the third peripheral sensor 40.
  • a strike position outside the circumference in which the first peripheral sensor 20 to the third peripheral sensor 40 are disposed can be detected. Therefore, even if the struck surface is formed in a rectangular shape, a polygonal shape, or a shape in which curved lines and straight lines are combined, a strike position from the center of the struck surface can be appropriately detected by the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40.
  • the central sensor 10 may be disposed at a position further from the center, and at least the first peripheral sensor 20 to the third peripheral sensor 40 may be disposed at equal intervals along the circumference centered on the central sensor 10. Accordingly, a strike position can be appropriately calculated based on the results detected by the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40.
  • the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at equal intervals along the circumference centered on the central sensor 10.
  • the first peripheral sensor 20 to the third peripheral sensor 40 may be disposed along a line of a polygonal shape, an elliptical shape, or the like surrounding the central sensor 10 rather than along the circumference centered on the central sensor 10, and may be disposed at unequal intervals.
  • the peripheral sensor strike position table 72c corresponding to such arrangement may be created according to actual measurement or the like, and the strike position may be calculated.
  • the gain constants in Equation 1 may be appropriately set according to actual measurement and the velocity may be calculated.
  • one central sensor 10 is disposed at the center of the struck surface.
  • the present invention is not necessarily limited thereto.
  • Two or more central sensors 10 may be disposed.
  • an average value of results of detection of the strike by the plurality of central sensors 10 and the like may be used when the velocity and the strike position are calculated.
  • three peripheral sensors that are the first peripheral sensor 20 to the third peripheral sensor 40 are disposed at equal intervals along the circumference centered on the central sensor 10.
  • the present invention is not necessarily limited thereto.
  • Three or more peripheral sensors may be disposed.
  • the peripheral sensors are disposed at equal intervals along the circumference centered on the central sensor 10.
  • two peripheral sensors may be disposed.
  • a strike position in a linear direction connecting the two peripheral sensors can be detected.
  • a strike position can be calculated according to weighted computation of the strike position obtained from the two peripheral sensors and the strike position obtained from the pitch ⁇ Thw of the initial half wave of the central sensor 10.
  • one peripheral sensor may be disposed.
  • the peripheral sensor is one circular ring sensor (the sensor itself has a ring shape or is one sensor configured to detect vibration of a ring-shaped member that comes in contact with the head) centered on the central sensor 10.
  • the velocity is calculated by weighted computation of a peak value of the strike detected by the central sensor 10 and a peak value of the strike detected by the ring sensor.
  • the strike position is calculated according to a time difference between the peak of the strike detected by the ring sensor and the peak of the strike detected by the central sensor 10 (hereinafter referred to as a "strike position according to a time difference"). Accordingly, a strike position in the circumference in which the ring sensor is disposed can be calculated.
  • the strike position according to a time difference is a position (for example, on the outer peripheral side relative to a position of "75" in Fig. 3 ) at which the pitch ⁇ Thw of the initial half wave of the central sensor 10 can be completely detected within the scan time of the central sensor 10, weighted computation of the strike position according to a time difference and the strike position calculated according to the pitch ⁇ Thw of the initial half wave of the central sensor 10 is performed. A strike position is calculated based on the result.
  • the strike position according to a time difference is set as a strike position.
  • a strike position in the circumference in which the ring sensor is disposed is calculated according to a time difference between the peak of the strike detected by the ring sensor and the peak of the strike detected by the central sensor 10.
  • a strike position outside the circumference in which the ring sensor is disposed is calculated based on the pitch ⁇ Thw of the initial half wave of the central sensor 10. Accordingly, a strike position inside or outside the circumference can be calculated based on the detection result of the strike within the scan time of the central sensor 10. Therefore, when the struck surface is formed in a large size, it is possible to quickly calculate the strike position. Therefore, an instruction for generating a musical sound is not delayed.
  • the strike position calculated according to the pitch ⁇ Thw of the initial half wave of the central sensor 10 may be set as a strike position.
  • the strike position according to a time difference is calculated according to a time difference between the peak of the strike detected by the ring sensor and the peak of the strike detected by the central sensor 10.
  • a strike position may be calculated according to a difference or a ratio between the peak value of the strike detected by the ring sensor and the peak value of the strike detected by the central sensor 10.
  • a strike position may be calculated according to a detection time difference (that is, a difference between signal arrival times) of a falling (or rising) edge between the ring sensor and the central sensor 10.
  • the strike position for the central sensor 10 is calculated according to the pitch ⁇ Thw of the initial half wave.
  • a strike position may be calculated based on a peak position of the initial half wave detected by the central sensor 10, an area of the initial half wave, or the like.
  • a strike position can be calculated by weighted computation of the strike position obtained from (a difference or a ratio between strike detection times or strike strengths of) a plurality of sensors in the central sensor 10 and at least one peripheral sensor and the strike position obtained from the initial half wave of the central sensor 10.
  • measurement times for the scan time of the central sensor 10 and the scan time of the peripheral sensor each are 2 ms.
  • the measurement time may be set to 2 ms or more or 2 ms or less according to a size of the struck surface or a material of the struck surface.
  • measurement times for the scan time of the central sensor 10 and the scan time of the peripheral sensor may be different.
  • the central sensor 10 may be set to have a longer scan time as the peak appears later than the first peripheral sensor 20 to the third peripheral sensor 40 and the first peripheral sensor 20 to the third peripheral sensor 40 may be set to have a shorter scan time as the peak appears earlier.
  • the scan time of the peripheral sensor when the central sensor 10 detects a strike within the scan time of the peripheral sensor, the scan time of the peripheral sensor is stopped, and the scan time of the central sensor 10 starts.
  • the scan time of the central sensor 10 may not be provided even if the central sensor 10 detects a strike within the scan time of the peripheral sensor.
  • a velocity and a strike position are calculated from the values in the sensor value ring buffer 73b and the values in the sensor peak value memory 73c obtained so far, and an instruction for generating a musical sound is issued.
  • the value in the sensor peak value memory 73c of the central sensor 10 obtained within the scan time of the peripheral sensor may be set as a peak value of the central sensor 10.
  • any of the first peripheral sensor 20 to the third peripheral sensor 40 detects a strike earlier than the central sensor 10, it is conceivable that a position closer to the first peripheral sensor 20 to the third peripheral sensor 40 than to the central sensor 10 is struck.
  • a predetermined position for example, a position of "100" from an intermediate position (a position of "50") between the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 to the outermost periphery (a position of "127") may be set as a strike position.
  • a difference between a time at which the initial half wave of the central sensor 10 obtained within the scan time of the peripheral sensor starts and a time at which the scan time of the peripheral sensor ends may be set as the pitch ⁇ Thw of the initial half wave of the central sensor 10.
  • pre_gain_c that is, the value in the central sensor strike position gain memory 73f
  • a strike position may be calculated according to weighted computation in Equation 2. Accordingly, there is no need to wait for the scan time of the central sensor 10. Therefore, a delay of an instruction for generating a musical sound is additionally reduced, and a response to the strike becomes faster.
  • the central sensor 10 when the central sensor 10 detects a strike within the scan time of the peripheral sensor, the scan time of the peripheral sensor is stopped, and the scan time of the central sensor 10 starts.
  • the present invention is not necessarily limited thereto.
  • the scan time of the peripheral sensor is stopped, and "the scan time of the central sensor 10+the peripheral sensor" starts, which may be distinguished from "the scan time of the central sensor 10.”
  • the scan time is appropriately adjusted, for example, the scan time of the central sensor 10+the peripheral sensor is adjusted to a time shorter than 2 ms, it is possible to reduce the delay of an instruction for generating a musical sound.
  • a strike position is calculated by weighted computation of the strike position for the central sensor 10 and the strike position for the first peripheral sensor 20 to the third peripheral sensor 40.
  • the strike position calculated by the first peripheral sensor 20 to the third peripheral sensor 40 is less than "75"
  • a strike position is calculated using only the strike position calculated by the first peripheral sensor 20 to the third peripheral sensor 40.
  • the present invention is not necessarily limited thereto.
  • a region of the struck surface in which a strike position is calculated according to only the strike position calculated by the first peripheral sensor 20 to the third peripheral sensor 40 and a region of the struck surface in which a strike position is calculated according to only the strike position calculated by the central sensor 10 may be adjacent to each other.
  • a threshold value for determining whether a strike position is calculated according to only the strike position detected by the first peripheral sensor 20 to the third peripheral sensor 40 is a position of "75.”
  • the present invention is not necessarily limited thereto.
  • a boundary value may be a value of "75" or less or a value of "75" or more.
  • a strike position is acquired with reference to the central sensor strike position table 72b according to the pitch ⁇ Thw of the initial half wave of a voltage waveform according to the strike of the central sensor 10.
  • a strike position may be acquired from the pitch ⁇ Thw of the initial half wave according to computation.
  • the central sensor strike position table 72b may be omitted in a configuration. Therefore, it is possible to reduce the size of the ROM 72.
  • a strike position for the central sensor 10 is calculated with reference to the central sensor strike position table 72b according to the pitch ⁇ Thw of the initial half wave detected by the central sensor 10.
  • a strike position may be calculated based on a peak position of the initial half wave detected by the central sensor 10, an area of the initial half wave, or the like.
  • a strike position is acquired with reference to the peripheral sensor strike position table 72c according to the time differences ⁇ T1 and ⁇ T2 of the peak of the strike between the first peripheral sensor 20, and the second peripheral sensor 30 and the third peripheral sensor 40.
  • a strike position may be acquired when the time differences ⁇ T1 and ⁇ T2 of the peak of the strike are computed.
  • the peripheral sensor strike position table 72c may be omitted in a configuration. Therefore, it is possible to reduce the size of the ROM 72.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 is calculated with reference to the peripheral sensor strike position table 72c according to the time difference ⁇ T1 between peaks of the first peripheral sensor 20 and the second peripheral sensor 30 and the time difference ⁇ T2 between peaks of the first peripheral sensor 20 and the third peripheral sensor 40.
  • a strike position may be calculated based on a difference of peak values between the first peripheral sensor 20 to the third peripheral sensor 40 or a ratio between peak values.
  • the time difference between peaks of the first peripheral sensor 20 and the second peripheral sensor 30 is set as ⁇ T1
  • the time difference between peaks of the first peripheral sensor 20 and the third peripheral sensor 40 is set as ⁇ T2.
  • a detection time difference that is, a difference between signal arrival times
  • a detection time difference of a falling (or rising) edge between the first peripheral sensor 20 to the second peripheral sensor 30 may be set as ⁇ T1
  • a detection time difference of a falling (or rising) edge between the first peripheral sensor 20 and the third peripheral sensor 40 may be set as ⁇ T2.
  • the strike position for the first peripheral sensor 20 to the third peripheral sensor 40 may be calculated from the peripheral sensor strike position table 72c using ⁇ T1 and ⁇ T2.
  • the strike position when a strike position is acquired, the strike position is acquired according to a difference in detection times of the strike by the first peripheral sensor 20 to the third peripheral sensor 40.
  • a strike position may be acquired according to a difference in detection times of the strike by the first peripheral sensor 20 to the third peripheral sensor 40, and the central sensor 10.
  • a strike position according to a time difference of peaks of the central sensor 10 and the first peripheral sensor 20 to the third peripheral sensor 40 may be added to the peripheral sensor strike position table 72c.

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Claims (15)

  1. Elektronisches Schlaginstrument (1) umfassend:
    eine Schlagoberfläche (3a); Schlagsensoren (10, 20, 30, 40), welche konfiguriert sind, einen Schlag auf der Schlagoberfläche (3a) zu erfassen, wobei die Schlagsensoren (10, 20, 30, 40) einen zentralen Sensor (10), welcher an einem zentralen Abschnitt der Schlagoberfläche (3a) angeordnet ist, wenn die Schlagoberfläche (3a) in einer Draufsicht betrachtet wird, und eine Vielzahl an peripheren Sensoren (20, 30, 40), die auf der Schlagoberfläche (3a) angeordnet sind, umfassen;
    wobei das elektronische Schlaginstrument (1) weiterhin dadurch gekennzeichnet ist, dass es umfasst:
    ein erstes Positionsberechnungsgerät (S34), das konfiguriert ist, eine erste Schlagposition von dem zentralen Sensor (10), basierend auf einer anfänglichen Halbwelle einer Schlagwellenform des Schlags, welcher durch den zentralen Sensor (10) erfasst wird, zu berechnen, in einem Fall, wenn die anfängliche Halbwelle durch den zentralen Sensor (10) erfasst wird, innerhalb einer ersten vorbestimmten Zeit, nachdem der zentrale Sensor (10) den Schlag erfasst;
    ein zweites Positionsberechnungsgerät (S36), das konfiguriert ist, eine zweite Schlagposition, basierend auf einer Differenz in der Schlagerfassung des Schlags durch die Vielzahl an peripheren Sensoren (20, 30, 40) zu berechnen; und
    ein Tonerzeugungsanweisungsgerät (S41), das konfiguriert ist, die Erzeugung eines Schlagtons, basierend auf der ersten Schlagposition, welche durch das erste Positionsberechnungsgerät (S34) berechnet wird und der zweiten Schlagposition, welche durch das zweite Positionsberechnungsgerät (S36) berechnet wird, zu instruieren,
    wobei die Vielzahl an peripheren Sensoren (20, 30, 40) wenigstens drei periphere Sensoren (20, 30, 40) sind, die entlang eines Umfangs zentriert auf dem zentralen Sensor (10) angeordnet sind und in einem Bereich auf der Schlagoberfläche (3a), in welchem, wenn die Schlagoberfläche (3a) geschlagen wird, der Schlag durch die Vielzahl an peripheren Sensoren (20, 30, 40), innerhalb einer zweiten vorbestimmten Zeit, nachdem der zentrale Sensor (10) den Schlag erfasst, erfasst werden kann und in einem Bereich auf der Schlagoberfläche (3a), in welchem die anfängliche Halbwelle der Schlagwellenform des zentralen Sensors (10), durch den zentralen Sensor (10), innerhalb der ersten vorbestimmten Zeit erfasst werden kann, nachdem der zentrale Sensor (10) den Schlag erfasst.
  2. Elektronisches Schlaginstrument (1) gemäß Anspruch 1,
    wobei die peripheren Sensoren (20, 30, 40), in einem Bereich auf der Schlagoberfläche (3a) angeordnet sind, in welchem, wenn eine Position innerhalb des Umfangs, der durch die drei peripheren Sensoren (20, 30, 40) gebildet wird, geschlagen wird, die peripheren Sensoren (20, 30, 40), den Schlag innerhalb der zweiten vorbestimmten Zeit erfassen können, nachdem der zentralen Sensor (10) den Schlag erfasst und in einem Bereich auf der Schlagoberfläche (3a), in welchem, wenn die Schlagoberfläche (3a) geschlagen wird, die anfängliche Halbwelle der Schlagwellenform, durch den zentralen Sensor (10) innerhalb der ersten vorbestimmten Zeit erfasst werden kann, nachdem der zentrale Sensor (10) den Schlag erfasst und
    wobei das zweite Positionsberechnungsgerät (S36) die zweite Schlagposition innerhalb des Umfangs, in welchem die peripheren Sensoren (20, 30, 40) angeordnet sind, basierend auf einer Differenz in der Schlagerfassung des Schlags, welcher durch die peripheren Sensoren (20, 30, 40) erfasst wird, berechnet.
  3. Elektronisches Schlaginstrument (1) gemäß Anspruch 1 oder 2,
    wobei die Schlagoberfläche (3a) in einer Kreisform, einer rechteckigen Form, einer polygonalen Form, oder in einer Form, in welcher gekrümmte Linien und gerade Linien kombiniert sind, ausgebildet ist, wenn die Schlagoberfläche (3a) in einer Draufsicht betrachtet wird.
  4. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Ansprüche 1 bis 3,
    wobei die peripheren Sensoren (20, 30, 40) so angeordnet sind, dass sie den zentralen Sensor (10) umgeben.
  5. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Ansprüche 1 bis 4, wobei die peripheren Sensoren (20, 30, 40) entlang eines Umfangs zentriert auf dem zentralen Sensor (10) oder entlang einer Linie einer polygonalen Form oder einer elliptischen Form, welche den zentralen Sensor (10) umgibt, angeordnet sind und
    wobei die peripheren Sensoren (20, 30, 40) in gleichen oder ungleichen Intervallen angeordnet sind.
  6. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Anspräche 1 bis 5, umfassend:
    eine erste Schlagpositionstabelle (72b), in welcher die erste Schlagposition entsprechend einer ersten einer ersten Variable gespeichert ist,
    wobei ein Abschnitt von einem Startpunkt (Ts) der anfänglichen Halbwelle der Schlagwellenform des Schlags, welcher durch den zentralen Sensor erfasst wird,
    zu einem Nulldurchgangspunkt (Te) als Abstand (ΔThw) der anfänglichen Halbwelle festgelegt wird,
    wobei der Abstand (Δ Thw) der anfänglichen Halbwelle als erste Variable verwendet wird, wobei das erste Positionsberechnungsgerät (S34) die erste Schlagposition, basierend auf der ersten Schlagpositionstabelle (72b), berechnet.
  7. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Ansprüche 1-6, umfassend:
    eine zweite Schlagpositionstabelle (72c), in welcher die zweite Schlagposition entsprechend einer zweiten Variable gespeichert ist, wobei eine Differenz in der Schlagerfassung des Schlags, welcher durch die peripheren Sensoren (20, 30, 40) erfasst wird, als die zweite Variable verwendet wird,
    wobei das zweite Positionsberechnungsgerät (S36) die zweite Schlagposition, basierend auf der zweiten Schlagpositionstabelle (72c), berechnet.
  8. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Ansprüche 1-7, umfassend:
    Ein drittes Positionsberechnungsgerät (S40), das konfiguriert ist, eine dritte Schlagposition, durch gewichtete Berechnung der ersten Schlagposition, welche durch das erste Positionsberechnungsgerät (S34) und die zweite Schlagposition, welche durch das zweite Positionsberechnungsgerät (S36) berechnet wird, zu berechnen.
    wobei das Tonerzeugungsanweisungsgerät (S41), die Erzeugung eines Schlagtons, basierend auf der dritten Schlagposition, welche durch das dritte Positionsberechnungsgerät (S40) berechnet wird, instruiert.
  9. Elektronisches Schlaginstrument (1) umfassend:
    eine Schlagoberfläche (3a); Schlagsensoren (10, 20), die konfiguriert sind, einen Schlag auf der Schlagoberfläche (3a) zu erfassen,
    wobei die Schlagsensoren einen zentralen Sensor (10), welcher in einem zentralen Abschnitt der Schlagoberfläche (3a) angeordnet ist, wenn die Schlagoberfläche (3a) in einer Draufsicht betrachtet wird, und einen peripheren Sensor (20), welcher auf der Schlagoberfläche (3a) angeordnet ist, und welcher ein Ringsensor ist, der in einer Kreisform entlang eines Umfangs zentriert auf dem zentralen Sensor (10) ausgebildet ist, umfassen:
    das elektronische Schlaginstrument (1), ist weiterhin dadurch gekennzeichnet, dass es umfasst:
    ein erstes Positionsberechnungsgerät (S34), das konfiguriert ist, eine erste Schlagposition von dem zentralen Sensor (10), basierend auf einer anfänglichen Halbwelle einer Schlagwellenform des Schlags zu berechnen, welcher durch den zentralen Sensor (10) erfasst wird, in einem Fall, wenn die anfängliche Halbwelle durch den zentralen Sensor (10) innerhalb einer ersten vorbestimmten Zeit erfasst wird, nachdem der zentralen Sensor (10) den Schlag erfasst; und
    ein zweites Positionsberechnungsgerät (S36), das konfiguriert ist, eine zweite Schlagposition, basierend auf einer Differenz in der Schlagerfassung des Schlags, durch den zentralen Sensor (10) und den peripheren Sensor (20), zu berechnen; und
    ein Tonerzeugungsanweisungsgerät (S41), das konfiguriert ist, die Erzeugung eines Schlaggeräuschs, basierend auf der ersten Schlagposition, welche durch das erste Positionsberechnungsgerät (S34) berechnet wird und der zweiten Schlagposition, welche durch das zweite Positionsberechnungsgerät (S36) berechnet wird, zu instruieren,
    wobei der periphere Sensor (20) in einem Bereich auf der Schlagobertläche (3a) angeordnet ist, in welchem, wenn eine Position innerhalb des Umfangs, der durch den Ringsensor (20) gebildet ist, geschlagen wird,
    der Ringsensor (20) den Schlag, innerhalb einer zweiten vorbestimmten Zeit zweiten vorbestimmten Zeit erfassen kann, nachdem der zentrale Sensor (10) den Schlag erfasst, und in einem Bereich auf der Schlagoberfläche (3a), in welchem, wenn die Schlagoberfläche (3a) geschlagen wird, die anfängliche Halbwelle der Schlagwellenform durch den zentralen Sensor, innerhalb der ersten vorbestimmten Zeit erfasst werden kann, nachdem der zentrale Sensor (10) den Schlag erfasst.
  10. Elektronisches Schlaginstrument (1) gemäß Anspruch,
    wobei das zweite Positionsberechnungsgerät (S40) die zweite Schlagposition innerhalb des Umfangs, in welchem der Ringsensor (20) angeordnet ist, basierend auf einer Differenz in der Schlagerfassung des Schlags, welcher durch den zentralen Sensor (10) und den Ringsensor (20) erfasst wird, berechnet.
  11. Elektronisches Schlaginstrument (1) gemäß Anspruch 9 oder 10,
    wobei der Ringsensor (20) eine Ringform aufweist.
  12. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Ansprüche 9 bis 11, umfassend:
    ein drittes Positionsberechnungsgerät (S40), das konfiguriert ist, eine dritte Schlagposition durch gewichtete Berechnung der ersten Schlagposition, welche durch das erste Positionsberechnungsgerät (S34) berechnet wird und der zweiten Schlagposition, welche durch das zweite Positionsberechnungsgerät (S36), berechnet wird, zu berechnen.
  13. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Ansprüche 9 bis 12,
    wobei die Differenz in der Schlagerfassung, eine Differenz in den Schlagerfassungszeiten oder eine Differenz in den Schlagstärken ist.
  14. Elektronisches Schlaginstrument (1) gemäß irgendeinem der Ansprüche 9 bis 13,
    wobei eine Schlagposition innerhalb des Umfangs, in welchem der Ringsensor (20) angeordnet ist, basierend auf einer Schlagerfassung des Schlags, welcher durch den zentralen Sensor (10) und den Ringsensor (20) erfasst wird, berechnet wird und eine Schlagposition außerhalb des Umfangs, basierend auf einer Schlagerfassung des Schlag, welcher nur durch den zentralen Sensor (10) erfasst wird, berechnet wird.
  15. Elektronisches Schlaginstrument (1) umfassend:
    eine Schlagoberfläche (3a); Schlagsensoren (10, 20, 30, 40), die konfiguriert sind, einen Schlag auf der Schlagoberfläche (3a) zu erfassen, wobei die Schlagsensoren einen zentralen Sensor (10), welcher auf einem zentralen Abschnitt der Schlagoberfläche (3a) angeordnet ist, wenn die Schlagoberfläche (3a) in einer Draufsicht betrachtet wird, und eine Vielzahl an peripheren Sensoren (20, 30, 40), die auf der Schlagoberfläche (3a) angeordnet sind, umfassen;
    das elektronische Schlaginstrument (1), ist weiterhin dadurch gekennzeichnet, dass es umfasst:
    ein erstes Positionsberechnungsgerät (S34), das konfiguriert ist, eine erste Schlagposition von dem zentralen Sensor (10), basierend auf einer anfänglichen Halbwelle einer Schlagwellenform des Schlags, welcher durch den zentralen Sensor (10) erfasst wird, zu berechnen, in einem Fall, wenn eine anfängliche Halbwelle durch den zentralen Sensor (10), innerhalb einer ersten vorbestimmten Zeit erfasst wird, nachdem der zentrale Sensor(10) den Schlag erfasst.
    ein zweites Positionsberechnungsgerät (S36), das konfiguriert ist, eine zweite Schlagposition, basierend auf einer Differenz in der Schlagerfassung des Schlags durch die Vielzahl an peripheren Sensoren (20, 30, 40), zu berechnen;
    ein drittes Positionsberechnungsgerät (S40), das konfiguriert ist, eine dritte Schlagposition durch gewichtete Berechnung der ersten Schlagposition, welche durch das erste Positionsberechnungsgerät (S34) berechnet wird und die zweite Schlagposition, welche durch das zweite Positionsberechnungsgerät (S36) berechnet wird, zu berechnen;
    und ein Tonerzeugungsanweisungsgerät (S41), das konfiguriert ist, die Erzeugung eines Schlagtons, basierend auf der dritten Schlagposition, welche durch das dritte Positionsberechnungsgerät (S40) berechnet wird, zu instruieren.
EP17188075.0A 2016-08-30 2017-08-28 Elektronisches schlaginstrument Active EP3291223B1 (de)

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US20200327872A1 (en) * 2019-04-15 2020-10-15 Guy Shemesh Electronic percussion instrument

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US10276141B2 (en) 2019-04-30
US10255895B2 (en) 2019-04-09
EP3291222A1 (de) 2018-03-07
US20180061388A1 (en) 2018-03-01
EP3291222B1 (de) 2019-09-11
US20180061387A1 (en) 2018-03-01
US20180061386A1 (en) 2018-03-01
US10181313B2 (en) 2019-01-15
EP3291221A1 (de) 2018-03-07
EP3291223A1 (de) 2018-03-07

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